1: Fundamentals
2: HTML
3: Tools
4: Deployment
5: JavaScript
6: TypeScript
7: CSS
8: DOM and Events
9: Networking
10: Browser API
11: Node.js
12: Bun
13: HTTP Servers
14: Forms
15: Databases
16: React
17: Astro
18: Libraries and frameworks
19: Next.js
20: Game Development
21: Security
22: Docker
23: Python
24: PHP
25: Laravel
26: Go
27: C
28: Linux
29: Swift
30: Electronics

The Valley of Code

All rights reserved © 2026

A Flavio Copes project, yes all the 1,664 lessons have been handwritten in over 8 years with passion and sweat, it's not AI slop. Claude Code estimated 5,000 hours of work to write them, that's 2.5 years 24/7.

changelog

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Changelog

January 2026

I spent a lot of time on this huge update, turning a thousand blog posts, uncategorized, into units and sections organized by topic.

  • HTML: Added HTML Tables, HTML Media, HTML Forms, More HTML, HTML Tips
  • CSS: Reorganized with CSS Animations, Selectors, Box Model, Visual Styling, More CSS, CSS Tips
  • JavaScript: Expanded with Strings, Numbers, Advanced JS, Dates, Data Structures, Algorithms, RegExp, ES History, Common Errors, Recipes, Concepts, Runtimes, DOM Recipes, Canvas, Libraries
  • Node.js: Added Files, CLI, HTTP, NPM, ESM, Concepts, Modules, Setup, Debugging, Tips, Images, Puppeteer
  • Laravel: Added Blade, Database, Auth, Commands, Deployment
  • React: Split into Basics, Hooks, State, Routing, Forms, Styling, Patterns, Debugging, Tips
  • Astro: Split into Basics, Content, Routing, Integrations, Tips
  • Next.js: Split into Pages Router, App Router, Tips, Debugging
  • Databases: Added Database Theory, SQLite, MySQL, PostgreSQL, MongoDB, Prisma
  • Browser APIs: Added File APIs, URL API, Networking, Binary Data, Web Workers, PWA, Media/WebRTC, UI APIs, Web Components
  • Networking: Added Networking Fundamentals, Nginx, GraphQL
  • Deployment: Added macOS, Fly.io, Railway, Firebase, AWS
  • Tools: Added VS Code Tips, Git Advanced, GitHub Advanced, Build Tools, Notion API, Tools Tips
  • Other: Added Shell Scripting, Phaser, Security

November 2025

  • The BIG UPDATE is here! The Valley of Code is back and now is bigger and better than ever!
  • Added new Python section!
  • Added new PHP section!
  • Added new C section!
  • Added new Go section!
  • Added new Swift section!
  • Added new Linux section!
  • Added new Electronics & Arduino section!
  • Added new Docker section!
  • Added new Laravel unit!
  • Added new Redis unit!
  • Improved lesson navigation and minor UI refinements across all units.
  • Fixed typos and clarified explanations in several lessons.

February 2024

January 2024

December 2023

November 2023

  • First public version released!