I find my git graph, git save, and git lint (also, git fetch --prune but lo alias for that one) extremely useful.

Aliases in my ~/.gitconfig:

    [alias]
        co = checkout
        cm = !git add -A && git commit
        br = branch
        ci = commit
        st = status
        unstage = reset HEAD --
        recent = for-each-ref --count=10 --sort=-committerdate refs/heads/ --format="%(refname:short)"
        overview = log --all --oneline --no-merges
        recap = !git log --all --oneline --no-merges --author=${1-$(git config user.email)}
        today = !git log --all --since=00:00:00 --oneline --no-merges --author=${1-$(git config user.email)}
        changelog = !git log --oneline --no-merges ${1-$(git describe --abbrev=0)}..HEAD
        upstream = !git log --oneline --no-merges HEAD..${1-$(git branch -lvv | perl -ne '/^\\*.*\\[(.*?)\\]/ and print "$1\n"')}
        local = !git log --oneline --no-merges ${1-$(git branch -lvv | perl -ne '/^\\*.*\\[(.*?)\\]/ and print "$1\n"')}..HEAD
        graph = log --oneline --graph --all --decorate --date=iso
        save = !git add -A && git commit -m 'SAVEPOINT'
        undo = reset HEAD~1 --mixed
        backup = !git push origin/backup/$(whoami)/$(git branch)
        lint = !git branch --merged | grep -v \"^\\s*master$\" | grep -v \"\\*\" | xargs -n 1 git branch -d