If there are parts that you feel could have been described better, let us know in the live chat. This entire book was built using Git, so you can see the process by which it was created on its GitHub page. Because it is licensed under the CC BY-SA 4.0, you are free to make and distribute your own changes.
There are a few places where we have departed from vanilla git in a significant way. We are not rebels without cause, our cause is right here.