my ~/.gitconfig file

[user]
    name = Viktor Kelemen

[color]
    diff = auto
    status = auto
    branch = auto
    interactive = auto
    ui = true
    pager = true

[color "status"]
    added = yellow
    changed = green
    untracked = cyan

[core]
    pager = less -FRSX
    whitespace=fix,-indent-with-non-tab,trailing-space,cr-at-eol

[alias]
    co = checkout
    st = status
    ci = commit
    co = checkout
    w = whatchanged
 lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative

You can find more about .gitconfig customization on Hackernews or on Stackoverflow