Here’s a good intro:
http://rogerdudler.github.io/git-guide/
And a more advanced workflow
http://blogs.atlassian.com/2014/01/simple-git-workflow-simple/
And one more with some useful info
http://sethrobertson.github.io/GitBestPractices/
Rob Taylor
TD Media, Inc.
http://tdmedia.com
And a few more:
http://haacked.com/archive/2014/02/21/reviewing-merge-commits/
http://git-scm.com/book/en/Git-Branching-Basic-Branching-and-Merging