Get Git
Mac: http://code.google.com/p/git-osx-installer/downloads/list?can=3
Linux: http://book.git-scm.com/2_installing_git.html
Ubuntu Linux: https://launchpad.net/~git-core/+archive/ppa
Windows: Full installer for official Git for Windows
Basic Git
Git cheat sheets and other resources
http://rogerdudler.github.com/git-guide/
http://byte.kde.org/~zrusin/git/git-cheat-sheet-medium.png
http://nvie.com/posts/a-successful-git-branching-model/
http://zrusin.blogspot.com.au/2007/09/git-cheat-sheet.html
http://thinkvitamin.com/code/starting-with-git-cheat-sheet/
http://ndpsoftware.com/git-cheatsheet.html#loc=workspace;
http://blog.fournova.com/2011/06/git-cheat-sheet/
http://jan-krueger.net/development/git-cheat-sheet-extended-edition