This is the set of instructions, labs, and follow-along-with-the-instructor script for Matthew McCullough's Git courseware.
This course is taught via GitHub, No Fluff Just Stuff, JAX, SDC, 33rd Degree, DevNexus, JFokus and many other conferences and private events.
If you want to explore Git to a maximum depth, I recommend Scott Chacon's free Git ebook, ProGit. I also curate a series of Git links via Delicious bookmarks.