The folks over at fournova, maker of Tower, a Git client for the Mac, have a really nice Git Cheat Sheet available for download. There are plenty of Git cheat sheets around, of course, but this one is only two pages and one of those pages concerns Version Control Best Practices. That leaves you with one page full of Git commands that tell you how to do most things in Git from the command line.
This is a handy resource that you can bookmark or print. And it comes in three colors so no matter where you stand on the proper editor color themes, you should find a version that satisfies you.