Learn for free:
HTML: http://html.com
CSS: http://web.dev/learn/css
JavaScript: http://javascript.info
React: http://reactplay.io
API: http://rapidapi.com/learn
Python: http://learnpython.org
SQL: http://w3schools.com/sql
Git: http://git-scm.com/book
Vue: http://learnvue.co
JavaScript: http://javascriptquiz.com
Nextjs: http://nextjs.org/learn
PHP: http://phptherightway.com
GO: http://learn-golang.org
Open Source: http://markodenic.com/make-your-first-open-source-contribution/
AI: http://elementsofai.com
ML: http://freecodecamp.org/learn/machine-learning-with-python
Web3: http://learnweb3.io
Blockchain: http://cryptozombies.io
Flexbox: http://flexboxfroggy.com
SEO: http://markodenic.com/category/seo
Rust: http://rust-lang.org/learn
Design Patterns: https://refactoring.guru
from: https://twitter.com/denicmarko/status/1611312353500332032