All you have to do is type "alias [shortcut]='[original command]'

Here's a list of general ones I have set up for Git. You could copy and paste these directly or make your own.

alias gst='git status'
alias gc='git commit'
alias gco='git checkout'
alias gl='git pull'
alias gpom="git pull origin master"
alias gp='git push'
alias gd='git diff | mate'
alias gb='git branch'
alias gba='git branch -a'
alias del='git branch -d'