What Is ChatGPT? A Beginner's Guide
ChatGPT is an AI that answers your questions in natural language. Learn how it works, how to use it, what to watch out for, and why it's worth learning now.
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5 Essential Skills to Thrive with AI
Five foundational skills every student should build now — questioning, verification, critical thinking, English basics, and persistence — explained with diagrams for the AI era.
Triple Your Study Efficiency with ChatGPT
Concrete techniques for using ChatGPT as your study partner. The 3 elements of prompt design, subject-by-subject usage patterns, and NG habits to avoid — all explained with diagrams.
How to Use AI for English Learning
The best ways to use AI tools like ChatGPT and Claude for English learning. Essay correction, speaking practice, listening, vocabulary quizzes — experiences textbooks and apps alone can't deliver. With diagrams for students.
How to Learn Programming with AI
How to use ChatGPT, Claude, and GitHub Copilot to learn programming. Concrete strategies for error solving, code explanation, and generating practice problems — with diagrams for students.
Getting Started with AI Image Generation
An introduction to AI image generation using ChatGPT, Midjourney, Adobe Firefly, and Canva. How it works, the differences between major services, and copyright precautions — explained with diagrams for students.
The Era of AI Video Creation Is Here
How video-generation AI tools like Sora, Veo, Runway, and Pika work and how to use them. Major services, what they can do, and important precautions — explained with diagrams for students.
How to Do a Research Project with AI
How to use AI for your summer research project. Topic selection, background research, experiment planning, write-up, and presentation — how to work with AI as an assistant and the rules for getting good grades. With diagrams.
Intro to Prompt Engineering
Learn how to write prompts that get the answers you want from AI. Role-setting, context, few-shot examples, chain-of-thought, and more — key techniques used by professionals, explained with diagrams.
How to Choose the Right AI Tool
Decision criteria for choosing the right AI tool from the hundreds available. Use case fit, free vs. paid, safety, and Japanese language quality — a framework that doesn't depend on knowing the latest names, explained with diagrams for students.
AI Chat Risks and How to Stay Safe
The main risks of AI chat tools like ChatGPT and Claude — personal data leaks, misinformation, overuse, and impersonation — and how to stay safe. Key points every student should know, explained with diagrams.
Will AI Take Our Jobs? What the Employment Data Says
Employment forecasts from Goldman Sachs, McKinsey, the World Economic Forum, and the OECD laid out side by side. Jobs most and least affected by AI, explained with diagrams.
What Makes a Job Survive the AI Age?
The 3 qualities shared by jobs that survive in the AI age — physicality, accountability, and human connection — with specific examples and career guidance for upper-elementary through high school.
Can AI Really Help You Start a Side Business?
The reality of AI-powered side businesses. Income potential and difficulty by category — writing, images, video, e-commerce, and more — plus legal and age restrictions you should know before starting.
3 Qualities of People Who Thrive in the AI Age
The 3 qualities shared by people who keep thriving without being replaced by AI — asking better questions, verifying claims, and building empathy — with concrete daily actions for upper-elementary through high school.
The Main Companies Behind AI Services
OpenAI, Anthropic, Google, Meta, Microsoft, xAI, Amazon, DeepSeek — the world's leading AI companies, their flagship services and key features, organized for upper-elementary through high school with diagrams.
AI vs Robots: What's the Difference?
AI is the brain, robots are the body. The essential difference between AI and robots, what happens when they combine, and the latest examples from self-driving cars to humanoid robots — explained with diagrams.
How Will AI Change Schools in the Future?
Personalized learning, AI tutors, automated grading, the teacher's changing role — how AI is transforming school education, with real-world examples from Japan and abroad, explained with diagrams.
Latest AI News Roundup
Key AI industry news from 2025–2026 organized as a timeline. Model updates (GPT, Claude, Gemini, Sora), regulation, education, and robotics — explained with diagrams.
The Real Reason Kids Should Learn AI
The real reason kids should learn AI is to be on the side that uses it — not the side it uses. The skills AI-native students need, and what families, schools, and communities can do — a flagship article with diagrams and parents/guardians.
What Is Programming?
Programming means giving instructions to a computer to make it do what you want. Learn how it works, where it's used, and how to take your first step today.
5 Things Every Python Beginner Should Learn First
Python is used across AI, web development, and data analysis. Learn the 5 essentials — print, variables, if statements, for loops, and lists — with diagrams and runnable examples.
How to Choose Your First Programming Language
Not sure which language to start with? Compare Python, JavaScript, Scratch, C/C++, and Java to find the right first language based on what you want to build.
3 Portfolio Projects to Build Now
Showing a working project speaks louder than saying 'I can code.' Here are 3 portfolio examples that you can build — from a one-day intro site to a 2-month original app.
Build Simple Games with Python
Game creation is one of the fastest ways to feel the 'it works!' moment. With Python, you can build a playable game in 30–100 lines. Three beginner projects explained: number guessing, rock-paper-scissors, and typing practice.
How to Handle Errors When They Appear
Errors are part of programming for everyone. Learn to read them calmly with a clear mindset and a 4-step debugging approach — errors are road signs, not roadblocks.
Tips for Self-Studying Programming
How to learn programming without a tutor or school. Covers resource selection, daily time management, and what to do when you get stuck — a practical guide for students teaching themselves.
What Is the Programming Mindset?
The programming mindset means breaking problems into small steps and solving them in order. Illustrated examples from everyday life show how you can train this thinking style starting today.
What Is JavaScript? A Beginner's Guide
JavaScript runs right in your browser and powers like buttons, interactive maps, and live updates. Learn how it works and write your first line of code with nothing but a browser.
Is C Still Relevant Today?
C was created 50 years ago and is still actively used in operating systems, embedded systems, games, and scientific computing. Learn why it endures and whether students should learn it.
Why Learning Java Gives You a Career Edge
Java has powered banking, telecom, and enterprise systems for 30 years. Learn why it leads in job postings, salary, and stability—and how you can get started.
Git/GitHub Introduction — Understanding Version Control
Git and GitHub are tools used by developers everywhere. Learn how to track code history and collaborate with others—explained with diagrams.
How to Keep Going Without Giving Up
About 80% of programming learners hit a wall at some point. Learn the four common sticking points and concrete strategies to push through—for students who want to keep going.
Using ChatGPT to Learn Programming
Learn how to use ChatGPT, Claude, and Gemini to deepen your understanding while studying programming—not just to get answers. Five practical patterns .
5 Useful Tools You Can Build Yourself
Five practical tools that beginner to intermediate programmers can build—quiz apps, study planners, pocket-money trackers, and more from everyday life, explained with diagrams.
What Is Python Automation?
Learn how to automate repetitive tasks with Python and try practical examples students can use right away—Excel processing, web scraping, file organization, and more.
What Does a Programmer's Day Look Like?
Programmers don't write code all day. Meetings, design, code review, and research fill the rest. A real programmer's daily schedule explained with diagrams.
Python Career Map
Six career paths where Python is a core skill—AI, data science, web development, automation, and more. Job content and salary ranges explained with diagrams.
How to Finish a Small App
The most important thing in programming is the experience of actually finishing something. Learn the idea-to-launch flow and tips for not giving up—explained with diagrams.
How to Choose a Learning Site
There are hundreds of programming learning sites out there — but one you never stick with is useless. Learn the 5 axes you should use to find the right resource, explained with diagrams.
What Is Web Development? A Beginner's Guide
Web development means building websites and apps that run in a browser. Learn the difference between frontend and backend, the technologies involved, and how to take your first step — with diagrams.
What Is HTML? The Basics of Web Pages
HTML is the markup language that forms the skeleton of web pages. This illustrated guide covers how tags work, the most common tags, and how to write your very first page.
What Is CSS? The Technology That Changes Design
CSS (Cascading Style Sheets) is the language that controls a website's appearance. This illustrated guide explains the difference from HTML, how to write it, and how to handle layout, colors, and more.
Building Dynamic Sites with JavaScript
JavaScript is the language that adds interactivity to websites. This illustrated guide explains how click responses work, common use cases, and the first code you should write.
How to Build Your Own Website
Publishing your own website is closer than you think. This illustrated guide walks through the full process — creating an HTML file, choosing free tools, and going live with a URL.
Database and SQL Basics
Databases (DB) and SQL are technologies widely used behind web services. This illustrated guide explains how data is stored in table form and retrieved with queries.
Frontend vs Backend: What Is the Difference?
Frontend and backend are two common terms in web development. This illustrated guide explains the different responsibilities, technologies, and personality types that suit each role.
How Is a Login Feature Built?
What happens behind the scenes when you log in with an ID and password? This illustrated guide gently explains hashing, sessions, and tokens.
How Member Sites Work
How do membership sites work? Registration, login, access control, and billing explained with diagrams.
How to Build a Blog Site
Three ways to build a blog site (WordPress, static site generators, hand-coded) compared with diagrams.
What Is a Portfolio Site?
A portfolio site showcases your work online. Learn what you should include, when to start, and how to build one for free — with diagrams.
Intro to Responsive Design
Responsive design automatically adjusts layout for smartphones, tablets, and PCs. Learn the basics, media queries, and how to write your first responsive CSS — explained with diagrams.
API and JSON Basics
APIs connect web services and JSON is the data format they use. Learn how they work, real examples, and how to use them in JavaScript — explained with diagrams.
Domain vs URL: What's the Difference?
Domains and URLs look similar but mean different things. Learn how domains work, URL structure, and how to register a domain — explained with diagrams.
Web Designer vs Engineer: What's the Difference?
What's the difference between a web designer and a web engineer? Job roles, required skills, salary, and which type suits you — explained with diagrams.
How to Publish for Free with GitHub Pages
GitHub Pages lets you publish a website for free. A step-by-step guide from account creation to going live — explained with diagrams.
How to Choose an HTML/CSS Practice Site
Top 6 free sites to learn HTML and CSS compared by level. Features, difficulty, and who each suits — explained with diagrams.
How to Choose Web Development Tools
Editors, browsers, Git, and design tools for web development — a free starter set explained with diagrams.
How to Build a Mobile-Friendly Site
Tips for building a site that reads well on smartphones — with a checklist covering viewport, tap targets, font size, and image optimization. Explained with diagrams.
What Is a Web App?
Learn the difference between websites and web apps, explore the latest trends like SPA and PWA, and discover how students can start building their own web apps.
What Is Linux? A Beginner's Guide
Linux is a free OS that powers web servers, smartphones, and supercomputers. Learn its history, key features, and where it runs — with diagrams.
Windows vs. Linux: What's the Difference?
Windows and Linux are both OSes, but they differ in price, openness, and main use cases. A diagram-based comparison of their strengths and purposes.
Let's Install Ubuntu
Ubuntu is Linux's most popular distro. Three ways to try it without breaking your PC — USB boot, virtual machine, and dual boot — explained with diagrams.
Linux Command Basics: Terminal 101
The terminal lets you control your PC with text instead of a mouse. Learn how Linux commands are structured, how they run, and the first operations to try — with diagrams.
Top 10 Linux Commands: ls/cd/cat/grep & More
The 10 Linux commands you should learn first — ls, cd, cat, grep, find, and more — with real examples for upper-elementary through high school.
File Permissions Explained
Every Linux file has read, write, and execute permissions. Learn how to read permission strings and use chmod and chown — explained with diagrams.
What Is sudo?
sudo is the Linux command that grants administrator privileges. Learn why it exists, when to use it, and how to stay safe — with diagrams for upper-elementary through high school.
How to Connect via SSH
SSH lets you securely log into a remote server as if it were right in front of you. Learn the difference between password and key authentication, with diagrams for upper-elementary through high school.
Running a Server with Linux
Linux servers power websites and apps around the world. Learn what a server is, what kinds exist, and how to run one at home — with diagrams for upper-elementary through high school.
What Is a Terminal?
That black window with text that engineers type into — it's called a terminal. Learn why it exists, how it differs from a shell, and why engineers love it — explained with diagrams.
Why Program on Linux?
Why do most professional engineers program on Linux? We explain the differences from Windows and why Linux makes setting up a dev environment so much easier — with diagrams.
Why Engineers Use Linux
Google, Facebook, and IT engineers worldwide love Linux. We explain the 5 essential reasons — servers, automation, OSS culture, and more — with diagrams.
Intro to Building a Web Server on Linux
How to install Apache or nginx on Ubuntu and publish your own website. From installation to verification and going live — explained with diagrams.
Intro to Shell Scripting
Shell scripts let you bundle multiple commands into a single file and run them all at once. Learn the basics and useful tricks — explained with diagrams.
How to Choose Linux Learning Books
There are countless Linux books out there — how should students choose? We explain a level-by-level selection guide and the types of books that work best, with diagrams.
The Benefits of Learning Linux
How does learning Linux help your career, education, and skills? We explain 6 concrete benefits with diagrams.
GUI vs CUI: What's the Difference?
GUI means clicking icons with a mouse; CUI means typing commands. We explain the strengths of each and when to use which — with diagrams.
Linux on a Raspberry Pi
The Raspberry Pi is a full Linux PC the size of a credit card. Learn about the price, what you can do with it, and how to combine it with electronics projects — with diagrams.
What Linux Certifications Are There?
LPIC, Linux+, Red Hat — what kinds of Linux certifications exist? We explain which ones you can aim for and how to study, with diagrams.
Why Linux Will Help Your Future
Cloud, AI, IoT, embedded systems — Linux is the foundation of every major IT field. We explain why Linux is a skill that stays relevant for 20+ years, with diagrams.
What Is a Network?
A network is the system that connects computers together. Learn the difference between LAN, WAN, and the Internet, and trace how your home connects to the world, with diagrams.
How the Internet Works
The Internet connects computers worldwide using IP addresses and routers. Learn how data travels from your device to a server and back, explained step by step with diagrams.
What Is a Packet?
Packets are the small units that data is split into before traveling the Internet. Learn why data is divided, what's inside a packet header, and how packets are reassembled — with diagrams.
What Is an IP Address?
An IP address is like a street address for devices on a network. Learn the difference between global and private IP addresses, and how to check your own — with diagrams.
What Is DNS?
DNS converts domain names into IP addresses. Learn why websites become unreachable when DNS stops working, and how to use DNS to speed up your browsing — with diagrams.
What Is Wi-Fi?
Wi-Fi is wireless LAN technology used at home, school, and cafés. Learn how Wi-Fi works, the differences between Wi-Fi 5, 6, and 7, and how to connect — with diagrams.
What Does a Router Do?
Your home router is the hub of your network. Learn what four jobs it performs simultaneously, and why rebooting it fixes so many problems — explained with diagrams.
LAN vs WAN
LAN is the small network inside your home; WAN connects the whole world. Learn the difference, where the boundary is, and how to use this knowledge to troubleshoot — with diagrams.
Troubleshooting a Slow Home Connection
When your home Wi-Fi feels slow, there are 5 possible locations for the problem. Learn to isolate device, Wi-Fi signal, router, ISP, and server issues step by step — with diagrams.
5 Settings to Speed Up Your Wi-Fi
Five practical Wi-Fi improvements you can try at home — router placement, frequency band, channel, standard, and reboots — explained with diagrams. No new plan needed.
How to Reduce Online Game Lag
Lag in Apex, Fortnite, and other online games is almost always a network issue, not a skill issue. Learn how ping, wired LAN, and server region selection reduce lag — with diagrams.
Setting Up Wired LAN at Home
Learn how to improve your home network with wired LAN. Covers Wi-Fi vs. wired differences, what hardware you need, and tips for running cables between rooms — with diagrams.
What Is a VPN?
Learn how VPNs (Virtual Private Networks) work — encrypted tunnels, real-world uses, and why free VPNs can be risky. A short guide.
How to Read Internet Speed Numbers
Understand bps, Mbps, Gbps, download, upload, ping, and jitter — and learn how to objectively evaluate your home network. A short guide.
IPv4 vs. IPv6: What's the Difference?
Learn the difference between IPv4 and IPv6 — address exhaustion, IPoE connections, and why IPv6 can speed up your home network at night. A short guide.
How Does a School Network Work?
Learn how school campus LANs, content filtering, MDM device management, and one-device-per-student programs work. A short guide.
What Is 5G?
Learn how 5G differs from 4G — speed, latency, simultaneous connections, and the new possibilities low-latency wireless opens up. A short guide.
Fiber vs. Mobile: Which Home Internet Is Right for You?
Compare fiber optic and mobile home routers (4G/5G) for home internet — speed, stability, price, installation, and how to choose based on your family's needs.
What Does a Network Engineer Do?
Discover what network engineers actually do — the 4-stage job cycle, tools they use, salary ranges, and how to start heading in that direction as a student.
Why Networking Knowledge Pays Off in the Future
Learn why networking knowledge built during your students pays dividends across IoT, cloud, security, self-driving, and almost every future career. A short guide.
What Is Security?
Security means protecting information from theft, tampering, and destruction. Learn the three pillars (Confidentiality, Integrity, Availability) with real-world examples .
What Do Hackers Actually Do?
Not all hackers are criminals. White-hat hackers protect companies from attack. This article explains the three types of hackers and what they really do, with diagrams.
7 Rules for an Unbreakable Password
The correct way to create account-protecting passwords, organized into 7 rules. Length, no reuse, password managers — explained with diagrams.
What Is Two-Factor Authentication?
An essential guard for the era when passwords alone can't protect you — two-factor authentication explained with diagrams. How it works, SMS vs. app vs. hardware key, and setup steps.
How to Spot Phishing Scams
When an email or SMS pretending to be Amazon or a bank arrives, how do you tell real from fake? Phishing scam tactics and detection checkpoints explained with diagrams.
How to Spot Fake Websites
Tips for seeing through fake shops and social-media lookalike sites — explained with diagrams. Five judgment points: URL, padlock, operator info, payment methods, and reviews.
Protecting Your Privacy on Social Media
In an era where a school uniform photo can reveal your name and nearest station, here are the privacy settings and posting tips students need to protect themselves and their families.
What Happens When Your Device Gets a Virus?
What actually happens when a PC or smartphone gets infected with malware? Takeovers, data theft, and ransomware demands — symptoms and responses explained with diagrams.
Is Public Wi-Fi Dangerous?
Is the free Wi-Fi at cafés and stations safe? Man-in-the-middle attacks, fake access points, and eavesdropping risks — plus how to use public Wi-Fi safely. Explained .
Are USB Drives Dangerous?
Plugging in a found USB drive can lead to virus infection. Learn about USB risks — autorun, loss, and BadUSB attacks — with illustrated safety tips.
Intro to How Cyberattacks Work
DDoS, SQL injection, zero-day, ransomware — learn how the cyberattacks you hear about in the news actually work, with illustrated explanations.
Why Do Data Leaks Happen?
Data leaks are in the news every day — and most are caused not by hackers but by human error. Learn the main causes and how to protect your data, illustrated with diagrams.
Intro to Encryption
HTTPS, LINE's E2EE, and password storage. Learn how encryption — symmetric vs. asymmetric key cryptography — powers the services you use every day, illustrated with diagrams.
Online Crime Methods to Watch Out For
Tech support scams, SNS account hijacking, crypto fraud, impersonation. Learn the most common online crime tactics targeting young people, with illustrated tips on how to spot and avoid them.
Cybercrime in the AI Era
Deepfakes, voice cloning, AI-generated phishing. Learn how AI has upgraded cybercrime tactics and why 'verify by channel and passphrase' is the new defensive baseline.
Staying Safe on School PCs
Chromebooks, iPads, shared computers — learn how to use school devices safely. Login management, browsing history, USB rules, and activity logs explained with diagrams.
How to Protect Your Home PC
Eight essential defenses to keep your home PC safe. OS updates, antivirus, backups, router settings — illustrated in priority order.
What Is a White-Hat Hacker?
White-hat hackers use attack skills to defend — not harm. Learn what they do, what they earn, and how you can start the journey, with illustrated salary ranges and a roadmap.
How to Become a Security Engineer
Security engineers are in high demand. Learn the different specialties, required skills, education paths, and certifications — illustrated with a beginner roadmap.
What Security Certifications Are There?
From the IT Passport to CISSP and OSCP — a guide to security certifications by difficulty, cost, and study time, with a recommended 3-step path.
What Is a Server?
A server is a computer that provides services to other computers. Learn about web servers, mail servers, and how servers keep running 24/7 — with diagrams.
Where Does a Website Actually Run?
Websites run on either a shared hosting server, a VPS, or the cloud. Learn the differences between each option, how to choose, and what's inside a data center.
What Is a Data Center?
YouTube, Instagram, and LINE all run inside massive data centers. Learn how data centers work, how big they are, and what role they play — explained with diagrams.
What Is the Cloud?
You hear about "the cloud" all the time, but what does it actually mean? Learn the concept, how it differs from storing files on your own PC, and the most popular cloud services.
What Is a VPS?
A VPS (Virtual Private Server) sits between shared hosting and the cloud — your own dedicated server for as little as a few hundred yen per month. Learn how it works and what you can do with it.
Intro to AWS
AWS (Amazon Web Services) is the world's #1 cloud. Netflix, Nintendo, and JAL all use it. Learn the big picture, the key services, and how to start for free as a student.
Intro to Azure
Azure is Microsoft's cloud — world #2 in market share, with deep integration with Windows and Office. Learn Azure's features, key services, and how to get started, explained with diagrams.
What Is Google Cloud?
Google Cloud (GCP) is Google's cloud service, ranked #3 globally. Built on the same tech that powers Search, YouTube, and Gmail, it's growing fast in AI and data analytics. Explained for upper-elementary through high school.
How to Get Your Own Server
Want your own server? There are 4 options — from shared hosting starting around ¥100/month to setting up a PC at home. Compare cost and difficulty for upper-elementary through high school.
How to Register a Domain
A domain is your address on the internet. Learn how domains work, how to register one, and how to choose the right one — explained with diagrams.
How to Publish a Website
Learn every step to publish your own website for the world to see — write HTML, upload to a server, set up a domain, and enable SSL. Explained with diagrams.
What Is SSL?
Discover what the padlock icon in your browser address bar really means. Learn how SSL encrypts web traffic, the difference between http and https, and how to get a free certificate — explained with diagrams.
What Is a CDN?
YouTube and Netflix stream smoothly worldwide thanks to CDNs. Learn how a Content Delivery Network caches copies close to each user — explained with diagrams.
How to Host WordPress
WordPress powers a huge share of the web. Compare three hosting options — shared hosting, VPS, and WordPress.com — and learn the best way to get started.
How to Choose a Cloud Backup Service
Protect your data before your PC breaks. Compare Google Drive, iCloud, OneDrive, and Dropbox, and learn how you can pick the right backup service.
What Happens When a Server Goes Down?
LINE won't send, X is unreachable, you can't log into your game — what is actually happening when 'the server is down'? Causes and mechanics explained with diagrams.
What Does a Server Admin Do?
Server admins (infrastructure engineers, SREs) keep web services running 24/7. Learn what the job involves, what a typical day looks like, and the skills you need — explained with diagrams.
Why Learn Cloud?
Four big reasons to learn cloud computing: broader career options, higher salaries, flexible work styles, and the ability to publish your own projects worldwide — explained with diagrams.
What Cloud Certifications Exist?
An overview of the main cloud certifications from AWS, Azure, and GCP — from beginner levels accessible to beginners up to practitioner-grade exams, with difficulty, cost, and study tips.
Why Cloud Skills Stay Valuable
Cloud professionals are in demand for at least the next decade. Market growth, AI synergy, and the difficulty of replacing human judgment — why cloud skills hold their value, explained with data.
Windows vs Mac: What's the Difference?
Windows and Mac each have their own look, feel, and strengths. We compare price, compatible software, hardware, and use cases with diagrams.
Windows or Mac — How to Choose
How to choose between Windows and Mac using three axes: purpose, budget, and your environment. A decision flowchart and practical tips for first-time buyers.
How to Diagnose a Slow PC
A slow PC could be RAM, storage, background apps, or your network. Learn how to isolate the cause step by step — explained with diagrams.
Why Windows Updates Matter
Why are Windows Updates important? Learn what security patches, bug fixes, and feature updates contain — and why you shouldn't keep delaying them. Explained with diagrams.
WSL Intro — Running Linux Inside Windows
What is WSL (Windows Subsystem for Linux)? Learn how to run Linux inside Windows and how to use it for development and learning — explained with diagrams.
PowerShell Intro — Automating Windows
What is PowerShell? Learn how to automate file management, settings, and tasks on Windows using this scripting environment — explained with diagrams.
Why macOS Has UNIX Roots
Why does macOS have UNIX roots? Learn the history from NeXTSTEP to Darwin and why Terminal commands work the same as Linux — explained with diagrams.
How to Fix Storage Issues
Running out of storage space? Learn practical solutions — clearing temp files, moving data to the cloud, and adding an external SSD — explained with diagrams.
Why an SSD Makes Your PC Faster
Why does switching from HDD to SSD make a PC so much faster? Learn how they work, the speed difference, and lifespan considerations — explained with diagrams.
Why Rebooting Fixes Problems
Why does 'just restart it' actually work? Learn what rebooting resets — memory, processes, drivers, and cache — explained with diagrams.
5 Settings Every PC Beginner Should Know
Five settings to check when you first set up a new PC: power management, updates, backup, security, and startup apps — explained with diagrams.
First Steps When Something Goes Wrong
When your PC stops working, where do you start? This article explains the basic troubleshooting flow — reproduce, restart, search errors, isolate causes — with diagrams.
The 3-2-1 Backup Rule
Learn the 3-2-1 backup rule used by IT professionals: 3 copies, 2 types of media, 1 stored off-site. Explained with diagrams who want to protect their data.
Tips for Organizing Your Files
Stop losing files and wasting time searching. Learn naming conventions, folder depth limits, and tagging tricks used by professional designers and engineers — explained with diagrams.
How to Make Your Laptop Last Longer
Want your laptop to last 5+ years? Heat, charging habits, hinge care, and keyboard safety make all the difference. Practical tips explained with diagrams.
How to Extend Your Battery Life
Why does laptop battery life shrink over time, and what can you do about it? Learn how lithium-ion cells work, the 20-80% charging sweet spot, and how to check your battery health.
What Is a Windows Administrator?
What is the difference between a Windows Administrator and a Standard User? What does UAC do, and how should you use these accounts safely? Explained with diagrams.
Why So Many Developers Use Mac
Walk into any tech conference and you'll see a sea of MacBooks. Why do programmers and designers choose Mac? Four practical reasons explained with diagrams.
PC Buying Guide: How to Choose Without Regrets
Don't let the wrong PC choice slow you down. Five checkpoints — CPU, RAM, storage, display, and price — explained with diagrams so students can shop confidently.
Safe PC Habits
Keep your PC running safely for years with small daily, weekly, and monthly habits. Updates, backups, password management, and screen locks — explained with diagrams.
What Is a CPU?
The CPU is the "brain" of a computer. Learn what clock speed, cores, and threads mean, and how Intel, AMD, and Apple Silicon compare — with diagrams.
What Is a GPU?
Learn what a GPU does, how it differs from a CPU, why GPUs are essential for AI, and which brands to know — explained with diagrams.
What Is RAM? A Beginner's Guide
Find out what RAM (memory) does in a PC, how it differs from a CPU and SSD, and what the 8 GB vs. 16 GB difference really means — explained with diagrams.
SSD vs. HDD: What's the Difference?
Compare SSD and HDD storage — speed, price, lifespan, and failure risk — with clear diagrams for upper-elementary through high school.
What Is a Motherboard?
Find out what a motherboard does as the foundation of a PC, how it connects the CPU, RAM, and GPU, and why choosing the right spec matters — with diagrams for upper-elementary through high school.
What Is a Power Supply Unit (PSU)?
Learn about the PSU in a custom-built PC — wattage, 80 PLUS certification, and how to choose — explained with diagrams.
Parts List for a Custom PC Build
All 8 components you need to build a PC listed with their roles and budget estimates — a clear buying checklist for upper-elementary through high school.
Your First PC Build: A Beginner's Guide
A step-by-step guide to safely building your first PC — from gathering tools to the first boot check — illustrated across 5 stages. students can do it too!
Build vs. BTO: Which Should You Choose?
Compare the pros, cons, and ideal users of a full custom build versus a BTO (build-to-order) PC. A clear illustrated guide deciding which route to take.
How to Choose a Gaming PC
GPU, CPU, RAM, and monitor benchmarks to check before buying a gaming PC, plus budget guides for Full HD, WQHD, and 4K — illustrated with diagrams.
Building a PC on a Tight Budget
Tips for getting the best-feeling PC within a limited budget — including what to prioritise, where to save, and which compromises to avoid — illustrated with diagrams.
Can You Upgrade a Laptop?
How far can you upgrade a laptop? RAM and SSD swap feasibility, model-by-model trends, and tips if you want to modify their portable PC — with illustrated charts.
What Does a RAM Upgrade Actually Do?
Does adding RAM really make your PC faster? A use-case-by-use-case breakdown of when a RAM upgrade helps — and when it doesn't — illustrated with diagrams.
How to Speed Up Your PC with an SSD Swap
Why swapping from HDD to SSD slashes boot and app load times, plus a step-by-step guide to data migration and cloning — illustrated with diagrams.
Why Does My PC Get So Hot?
Why do CPUs and GPUs generate heat, what happens when a PC runs too hot, and how to keep temperatures in check — illustrated with diagrams.
What Do Cooling Fans Actually Do?
What cooling fans do inside a PC, the difference between air and liquid cooling, fan types and how to choose them — illustrated with diagrams.
How to Choose a Used PC
Checklist, units to avoid, and budget-range targets for buying a used laptop or desktop PC — an illustrated guide.
Is PC Repair Hard?
Common PC problems, repair difficulty levels, the line between DIY and professional repair — an illustrated troubleshooting guide .
Monitor Basics: How to Choose
The five key monitor specs — size, resolution, refresh rate, panel type, and connections — explained by use case, with illustrated charts .
Keyboard Basics: How to Choose
Membrane vs. scissor vs. mechanical, switch types, layout, size, and connection method — keyboard selection basics illustrated with diagrams.
Planning Your IT Career Path
There is no single road to becoming an IT engineer. This illustrated guide explains 5 steps you can take right now—from middle school through university and vocational school.
How to Become an IT Engineer
A concrete roadmap to becoming an IT engineer. Illustrated guide to the skills, paths, and first steps you need—with real examples.
IT Certifications You Can Earn
IT certifications sorted by difficulty, study time, and usefulness for upper-elementary through high school. Covers IT Passport, FE, MOS, CCNA, and more.
What Is the IT Passport?
The IT Passport is a national certification covering IT fundamentals broadly. This article explains the exam content, study time, and study methods suited to students.
What Is the FE Exam?
The FE (Fundamental Information Technology Engineer) exam is the gateway certification for engineers. Exam format, pass rates, Subject A/B, and study hours explained with diagrams.
Study Strategies for Joho I
Joho I (Japanese high school information curriculum) and the new University Entrance Common Test subject explained: exam scope, tough spots, and efficient study methods .
Can Humanities Students Become IT Engineers?
There is a path to IT engineering from a humanities background. Explains the preparation needed and the fields where humanities strengths are an asset—for upper-elementary through high school.
Is Not Being STEM a Disadvantage?
The STEM vs humanities divide is fading in IT. Explains the skills actually tested, where the differences matter, and study approaches that work for everyone.
10 IT Job Types Explained
Explore 10 key IT job types — from frontend and backend to AI, cloud, and security — with real salary data and tips for upper-elementary through high school.
How to Become an AI Engineer
Learn what AI engineers do, what skills they need, typical salaries, and a clear learning roadmap for upper-elementary through high school.
How to Become a Security Engineer
Learn what security engineers do, their key skill areas, major certifications, and a learning roadmap for upper-elementary through high school.
How to Become a Network Engineer
Learn what network engineers do, the skills required, key certifications like CCNA, and a learning roadmap for upper-elementary through high school.
How to Become a Cloud Engineer
Learn what cloud engineers do, required skills, AWS/Azure/GCP certifications, and a learning roadmap for upper-elementary through high school.
How to Become a Web Engineer
Learn about the 3 types of web engineers — frontend, backend, and full-stack — with skill breakdowns and a learning roadmap for upper-elementary through high school.
High-Salary IT Job Rankings
Rankings of the highest-paying IT jobs in Japan — AI, security, IT consultant, full-stack, SRE — with key traits and how to prepare from school.
Hackathons & Contests You Can Enter
A guide to hackathons and programming contests open to students — U-22, SECCON Beginners, Mitou Junior, and more — with benefits explained.
University or Vocational School — Which Is Better?
Comparing university and vocational school paths if you are aiming for an IT career: tuition, duration, graduation destinations, and which suits your goals.
What Do IT Companies Look For?
5 things IT company recruiters look for in new grads and young hires — GitHub, portfolio, communication, and more. Everything you can start building now.
What Is a Portfolio?
What a portfolio means in the IT industry, what to include, how to use GitHub, and project examples you can build right now.
The IT Talent Digital Kodomo BASE Wants to Nurture
The final article in Kids IT Lab. The vision of IT talent Digital Kodomo BASE cares about, and a wrap-up of everything the series has conveyed.