Exercism
Free coding practice platform with 70+ language tracks and human mentor feedback, solve exercises locally and get code reviews from volunteers.
Exercism offers free coding exercises across 70+ language tracks with opt-in human mentor feedback on submitted solutions. Each exercise comes with automated tests and a community discussion where you can compare approaches after solving.
Excellent for deliberate practice, choose a track, solve exercises at your own pace, submit for mentor review, and study other solutions to learn idiomatic patterns. The mentoring feedback loop accelerates skill development beyond what self-study alone can achieve.
URL
https://exercism.org/Recommended tools
MDN Web Docs
Mozilla's reference for HTML, CSS, and JavaScript, with browser compatibility tables, interactive examples, and standards-track documentation.
freeCodeCamp
Free coding curriculum with 10+ certifications covering web development, data science, and machine learning, supported by a global community.
CSS-Tricks
Long-running CSS blog with in-depth guides, almanac entries, and practical tips on modern CSS layout, animation, and responsive design.