Exercism
Code practice with human mentoring.
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About MDN Web Docs
MDN is the definitive documentation for HTML, CSS, and JavaScript, maintained by Mozilla — every web developer's most-visited reference.
Key features
- Complete web platform reference
- Interactive examples
- Browser compatibility tables
Pros
- Authoritative and current
- Compatibility data is invaluable
Cons
- Reference-first, not a course
- Depth can overwhelm beginners
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