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UNIX for Beginners Q & A UNIX for Dummies Questions & Answers
1

Hi

I wish to "develop" for brew. It is hosted on GitHub. What book (or online documentation) do you recommend me for GitHub and/or Git?

Prefer small physical book.

2

GitHub is self-explanatory. I suggest working through some examples in the manual on git itself: Git User?s Manual (for version 1.5.3 or newer)
You will likely benefit from working locally on a repository, just to try things out. Hence you need to install git first. Even working through half of the tutorial above should give you a good grasp of how to use git. At that point you will likely not need a reference manual. There is only a handful of commands that you will ever use.