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Looks like this is free again. Seemed popular when it was posted last year.
"Pro Git (Second Edition) is your fully-updated guide to Git and its usage in the modern world. Git has come a long way since it was first developed by Linus Torvalds for Linux kernel development. It has taken the open source world by storm since its inception in 2005, and this book teaches you how to use it like a pro."
Bargain link is for the Amazon AU store. Amazon US link here.
Also available as PDF, EPUB, & MOBI at https://git-scm.com/book/en/v2