For convenience: git checkout - ...quickly checking out the previous checked-out branch is really useful, as in... git checkout master && git pull && git checkout - && git merge master . I just have a script to do all that for me, of course.
For long term maintenance: git gc ...prunes and cleans up your repo. Learned the need for this the hard way early on, had a repo get corrupted (didn't have a clean enough workflow at that point).