Install
sudo aptitude install git-core
Basic Commands
git init ...init repository
git add . ...add everything in dir to repository
git commit -a -m 'update' ...add + commit changes
git diff ...show changes since last commit
git add [file] ...add file
git rm [file] ...remove file
git mv [file] ...move file
Mirror Git Repository
rsync -azvCL --delete --progress
-e "ssh -i /home/[user]/.ssh/[mykey]" .git/*
[user]@[user].strongspace.com:/home/[user]/[project]/.git/
Ignore Whitespace
git-apply --whitespace=nowarn
For list of "small set of commands to get you started", I'd drop "git status" and substitute it with "git diff" if I were you.
Anyway, have fun with git.
git's really shocking me with how fast and intelligent it is, much better than svn for small isolated stuff.