Simple explanation
Welcome to Day 21. Three weeks ago you had never opened Claude Code. Today you build something complete and put it live on the internet. Your 21-day toolkit — the full picture: Week 1 — The foundations: ✓ Claude Code installed and running — Day 1 ✓ The 4-part prompt formula — Day 2 ✓ Plan Mode for careful changes — Day 3 ✓ GitHub branch first habit — Day 4 ✓ Auto Mode for speed — Day 5 ✓ Error message recovery — Day 6 ✓ First homepage build — Day 7 Week 2 — Building smarter: ✓ CLAUDE.md permanent project memory — Day 8 ✓ Specific rules and style in CLAUDE.md — Day 9 ✓ Slash command shortcuts — Day 10 ✓ @ mention file targeting — Day 11 ✓ Multi-clauding parallel sessions — Day 12 ✓ Recovery process — Day 13 ✓ Lead capture page build — Day 14 Week 3 — Power user moves: ✓ Skills — expert shortcuts — Day 15 ✓ Personal Skills built for your project — Day 16 ✓ Big Plan Mode for complex projects — Day 17 ✓ /loop for background automation — Day 18 ✓ Sub-agents for parallel research — Day 19 ✓ Personal pre-session ritual — Day 20 Today's build: your choice Pick ONE option based on where your project is right now: Option A — If your site is not yet live: Deploy your site to Netlify today. Get a real URL. Share it with one real person by the end of the day. Option B — If your site is live but missing something important: Build the one page or feature your site most needs right now. The one you have been putting off because it felt too complex. Option C — If your site is live and working well: Build a paid kit landing page. A headline, a feature list, a price, and a buy button. This is the page that turns your free audience into paying customers.
What to do
Run your full pre-session ritual first Type /session-start. Answer its questions. Confirm your branch is created. Confirm CLAUDE.md is updated with today's goal. Do not skip this — today especially. The build process — Day 21 edition: 1. Write your one-page brief (from Day 17). 2. Turn on Plan Mode. Get the full plan before touching anything. 3. Review the plan. Adjust anything that looks wrong. 4. Switch to Auto Mode. Build the first section. 5. Open a second session with /loop 10m monitoring for errors. 6. Review each section as it completes. Use @ mentions for precision fixes. 7. Run /review when the build is complete. 8. Run your /launch-checklist Skill. 9. Test everything on your phone. 10. Fix anything the checklist or testing finds. 11. Merge to main with a clear descriptive commit message. 12. If deploying — push to Netlify and check the live URL. After you finish — do this one thing Write down three sentences: — What did I build today that I could not have built 21 days ago? — What was the hardest moment in this challenge — and what did I learn from it? — What am I building next? Keep those three sentences somewhere permanent. They are proof of what you can do now. What comes next This challenge taught you the foundations and the power moves. The NonDev Apps Latest Lessons page is updated regularly with new practical guides written specifically for non-developers. Bookmark it. Every lesson is a few minutes. You have not finished learning. You have finished being a beginner.
Copy-paste prompt
Following all rules in CLAUDE.md — this is my Day 21 final build. Run in auto mode. Here is what I am building: [describe your chosen option in full]. Use Plan Mode first to map every file and step. Then build one section at a time. After each section is complete, pause and wait for my review before continuing. When the full build is done, run /review automatically.
Course note
Key takeaway
You started this challenge as someone who had never used Claude Code. You finish it as someone who can plan, build, test, deploy, automate, and recover — using one of the most powerful AI tools ever built. Without writing a single line of code yourself. Now go build something.