Programming

Git

https://www.tutorialspoint.com/git/index.htm
https://git-scm.com/docs/gittutorial
https://try.github.io/
https://github.github.com/training-kit/downloads/github-git-cheat-sheet.pdf
https://overapi.com/git

HTML

https://www.w3schools.com/html/
https://www.tutorialspoint.com/html/index.htm
https://html.com/
https://htmlcheatsheet.com/
https://overapi.com/html

CSS

https://www.w3schools.com/Css/
https://www.tutorialspoint.com/css/index.htm
https://www.javatpoint.com/css-tutorial
https://overapi.com/css
https://htmlcheatsheet.com/css/

JavaScript

https://www.w3schools.com/js/DEFAULT.asp
https://www.tutorialspoint.com/javascript/index.htm
https://www.codecademy.com/learn/introduction-to-javascript
https://overapi.com/javascript
https://htmlcheatsheet.com/js/