Excerpt of my day-to-day job ~/.gitconfig

.gitconfig

[color]
ui = true

[color "branch"]
current = yellow reverse
local = yellow
remote = green

[color "diff"]
meta = yellow
frag = magenta
old = red
new = green

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

[apply]
whitespace = nowarn

[alias]
    drop = branch -D
    lasttag = git describe --tags `git rev-list --tags --max-count=1`
    adda = add --all
    st = status
    cam = commit -a -m
    ci = commit
    cia = commit --amend
    co = checkout
    cob = checkout -b
    br = branch
    sb = show-branch
    cp = cherry-pick
    hist = log --pretty=format:\"%h %ad | %s%d [%an]\" --graph --date=short#"
    unstage = reset HEAD --
    u = reset HEAD --
    m = merge --no-ff
    po = pull origin
    por = pull --rebase origin
    pusho = push origin
    pullo = pull origin
    pullro = pull --rebase origin
    pr= pull --rebase
    s = show --pretty=format: --name-only
    sl= stash list
    staged = diff --cached
    rb = rebase
    rba= rebase --abort
    rbc = rebase --continue
    rbs = rebase --skip
    rh = reset HEAD
    rl = reflog
    rs = remote show
    rt = remote
    ru = remote update
    rp = remote prune
    sm = submodule
    lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative
    copm = checkout project-mondossier
    corpm = checkout release-project-mondossier
    ll = log --pretty=format:"%C(yellow)%h%Cred%d\\ %Creset%s%Cblue\\ [%cn]" --decorate --numstat
    undo = reset --hard HEAD^
    getfile = git ls-tree -r HEAD | grep
    ignoreupd = ls-files --ignored --exclude-standard | xargs git rm --cached
	up = "!git remote update -p; git merge --ff-only @{u}"
    rebaseclean = rebase --preserve-merges

[log]
decorate = full

How to use?

Just open with a text editor the file ~/.gitconfig , and append/replace what you want.