I have had the opportunity to explain Git and the basics of its operation on more than one occasion.  It's something that I enjoy doing, especially because I believe it is an indispensable skill for collaboration in industry and academia.  I have always distributed a small "cheat sheet" with the most-used commands, and I am posting it here (for no reason other than I can find it quickly in the future).  I will include the text in this post, but I will also provide the .txt file that I use.  (Yes, I wrote it in a txt file.  I like the way it looks, and when I print it out using Notepad++, the wrapped text is indented nicely.