git_learn.md

https://github.com/Gazler/githug

https://learngitbranching.js.org

https://githowto.com/

https://github.com/jlord/git-it-electron

http://onlywei.github.io/explain-git-with-d3/

http://ndpsoftware.com/git-cheatsheet.html#loc=index;

http://justinhileman.info/article/git-pretty/git-pretty.png

https://ohmygit.org/

https://github.com/git-learning-game/oh-my-git

https://ndpsoftware.com/git-cheatsheet.html#loc=index;

https://github.com/benthayer/git-gud

https://www.leshenko.net/p/ugit/

https://www.developernation.net/blog/git-internals-list-of-basic-concepts-that-power-your-git-directory