gitgithub
git_cheat_sheet.pdf
https://rogerdudler.github.io/git-guide/files/git_cheat_sheet.pdf
Basic markdown syntax - GitHub Docs
https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax
Create sophisticated formatting for your prose and code on GitHub with simple syntax.
Git Tutorial: Get Started with Version Control | Tania Rascia
https://www.taniarascia.com/getting-started-with-git/