Git
Created Wednesday 03 June 2020
Free online book - https://git-scm.com/book/en/v2
History of Git - https://www.welcometothejungle.com/en/articles/btc-history-git
Large Git Collections:
https://github.com/
https://about.gitlab.com/
Git GUI apps
https://wiki.gnome.org/Apps/Gitg
https://www.gitkraken.com/
https://desktop.github.com/
Guides
(forgive the language, but useful) - https://ohshitgit.com/
And actually, for raw text, I prefer Bazaar ☺
https://bazaar.canonical.com/en/
Backlinks: Library