“Your book stinks. What other references can I use?”
Here are more! I found these by searching the Internet for Git book recommendations. The only ones I’ve used are the man pages and Pro Git.
If you have the manual pages (historically known as the “man pages”) installed on your system, and you probably do, you can get help for particular Git commands right from the command line.
For example, if you want to know about git config, you can type:
$ man git-config(The minus between “git” and “config” might or might not be required depending on your system, but I’ve never found a place where it doesn’t work.)
Once you’re in there, the arrow keys, space bar, and page up/down probably work to navigate, and hitting q or Escape probably quits. It depends on the pager your system uses.
These manual pages are very comprehensive, and don’t tend to be easy to read. But all the information is there! They can also be found in The Git Reference Manual, below.
If you know of more, mail them to beej@beej.us.