Extra Resources

1. MDN Web Docs (Mozilla Developer Network)

URL: https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics

MDN provides comprehensive CSS fundamentals covering syntax, features, and techniques, with interactive lessons that include "Test your skills" sections to check understanding. This is considered the gold standard reference for web developers and includes detailed explanations of CSS concepts from basic to advanced, with excellent browser compatibility information.

2. W3Schools CSS Tutorial

URL: https://www.w3schools.com/css/

W3Schools offers over 700 CSS examples with an interactive online editor where you can edit code and immediately view results, plus exercises and quizzes to test your knowledge. It's extremely beginner-friendly with a clear learning path and practical examples that you can try yourself in real-time.

3. web.dev Learn CSS (by Google)

URL: https://web.dev/learn/css

This evergreen CSS course provides organized modules covering everything from the box model and selectors to modern features like container queries, CSS Grid, and custom properties, with quizzes to earn badges. It's structured as a complete course that takes you from fundamentals to advanced topics with a modern, best-practices approach.