From my .gitconfig:

    # --- LOGS ---
    ll   = "log --pretty=oneline --abbrev-commit"
    lg   = log --pretty=oneline --abbrev-commit --graph --decorate --date=relative
    lgt  = log --graph --pretty=format:'%Cred%h%Creset %s %Cgreen(%cr)%Creset' --abbrev-commit --date=relative
    lgtt = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr)%Creset' --abbrev-commit --date=relative

I almost never user "git lgt" or "git lgtt." Instead I mostly use "git ll", and sometimes "git lg", though if you're doing a lot of merging around, the graph can get a bit convoluted.