Learn Claude Code

19 lessons across five levels, about 2.5 hours in total. Work through them in order, or jump to the level that matches you.

📄 Cheat sheet

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Level 1: Curious

What Claude Code is, how to install it and how to ask for what you want.

Lesson 1.1 · 6 min

What is Claude Code? Agentic coding explained

A beginner's guide to Claude Code: what agentic coding means, how it differs from a chatbot, and what you can build with it.

Lesson 1.2 · 7 min

Every way to use Claude Code

Terminal, VS Code, JetBrains, desktop, web, phone, GitHub, Slack, scripts and the Agent SDK: every place Claude Code runs and when to use each one.

Lesson 1.3 · 8 min

Install Claude Code and start a session

Step-by-step: install Claude Code on Mac, Windows or Linux, log in, open a project folder and run your first agentic coding session with confidence.

Lesson 1.4 · 7 min

How to talk to Claude Code: better prompts

Write clear Claude Code prompts: give context, define done, share examples and break big jobs into steps for better results with fewer retries.

🚲

Level 2: Getting going

Editing real files safely, steering with modes and undoing mistakes.

Lesson 2.1 · 8 min

How Claude Code works under the hood

What happens after you press Enter: the agentic loop, the tools Claude uses, how context and memory work, and where permissions and checkpoints fit.

Lesson 2.2 · 7 min

Reading and editing files, plus @ mentions

How Claude Code reads, searches and edits your files, how to review diffs, and how to use @ mentions to point Claude at the right files and folders.

Lesson 2.3 · 7 min

Claude Code permissions and plan mode

Claude Code permission prompts, auto-accept edits and plan mode: when to use each, how Shift+Tab switches between them, and how to stay safe.

Lesson 2.4 · 7 min

Git, undo and sessions: rewind and resume

Make mistakes safely in Claude Code. Use git commits, checkpoints and rewind to undo changes, and claude -c or -r to continue or resume previous sessions.

Lesson 2.5 · 7 min

What can you use Claude Code for? 12 everyday jobs

Twelve practical ways to use Claude Code: understanding a codebase, fixing bugs, writing tests, reviewing pull requests and building internal tools.

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Level 3: Daily driver

Memory, context and custom commands that make Claude feel like a teammate.

Lesson 3.1 · 8 min

CLAUDE.md explained: memory and /init

How CLAUDE.md memory files work in Claude Code, how /init creates one, the user, project and folder hierarchy, and what to put in yours.

Lesson 3.2 · 7 min

Slash commands and context management

Master Claude Code's built-in slash commands and the context window: when to /clear, when to /compact, and how to keep long sessions sharp.

Lesson 3.3 · 8 min

Custom slash commands and settings.json

Create your own Claude Code slash commands with markdown files, and configure settings.json for permissions, environment and team-wide defaults.

🏎️

Level 4: Power user

Skills, subagents, hooks and MCP: extend Claude Code to fit your workflow.

Lesson 4.1 · 9 min

Claude Code skills and subagents

Learn how Claude Code skills (SKILL.md) package reusable know-how and how subagents work in isolated context to keep your main session clean and fast.

Lesson 4.2 · 8 min

Claude Code hooks: automatic guardrails

Use Claude Code hooks to run your own scripts at key moments: auto-format after edits, block dangerous commands, add context and enforce rules every time.

Lesson 4.3 · 9 min

Does Claude Code write bloated or insecure code?

Why AI-written code can be bloated, chatty or insecure, and the CLAUDE.md rules, hooks and reviews that keep Claude Code output lean and safe.

Lesson 4.4 · 8 min

MCP servers and plugins for Claude Code

What the Model Context Protocol (MCP) is, how to add MCP servers to Claude Code for GitHub, databases and docs, and how plugins bundle it all together.

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Level 5: Pro

Automation, the Agent SDK and architecting production-grade agentic systems.

Lesson 5.1 · 9 min