21-Day Claude Code Challenge
A structured 21-day challenge that builds real skills — one day at a time. Learn Claude Code, GitHub, auto mode, and more.
21-day roadmap + bonus week
Week 1
Install Claude Code
Install Claude Code and run your first prompt.
The 4-part prompt formula
Learn the formula that gets results every time.
Plan Mode
Make Claude think before it builds.
GitHub branch first
The one habit that saves everything.
Auto Mode
Let Claude build without asking permission.
How to read error messages
Read errors without panicking.
Week 1 Build Day
A complete working homepage from scratch.
Week 2
The CLAUDE.md file
Give Claude permanent context for your project.
What to put in CLAUDE.md
The exact sections that make Claude smarter.
Slash commands
Shortcuts that save you time every session.
The @mention trick
Point Claude at exactly the right file.
Multi-clauding
Run multiple Claude sessions at the same time.
When AI goes wrong
How to recover when Claude breaks things.
Week 2 Build Day
Build a complete second feature from scratch.
Week 3
Skills
Teach Claude your workflow so you never repeat yourself.
Create your own skill
Build a custom skill for your exact project.
Plan Mode for big builds
Use Plan Mode before any complex change.
The loop command
Let Claude iterate without you watching.
Sub-agents
Run parallel tasks across your entire project.
Pre-session workflow
The 5-minute habit before every build session.
Final Build Day
Complete your app. Deploy it. You are done.
Bonus Week — Advanced Skills
What hooks are and how to add one safely
Inspect your real hook setup, add one safe notification hook, and verify it without guessing.
The context window — why Claude goes weird and how to fix it
Spot the warning signs of a full context and fix it in seconds with /compact.
The 5 Golden Rules — the checklist every session needs
Five rules that consistently produce better results and fewer mistakes.
What MCP is and how to inspect or add one connection safely
Inspect existing MCP access, add one safe read-only connection, and verify it before trusting it.
Subagents — how to give Claude Code a specialist job title
Create a reviewer subagent that checks your site through specialist eyes.
Basic safety rules before you let AI touch your files
Five safety rules every non-developer must know before running an AI session.
How to read a diff — and why you must before accepting any change
Read a diff in 30 seconds, catch unexpected changes, and revert only what you did not want.