I prefer to use inputrc instead of aliases. Put the following into your .inputrc
"\C-gs": "git status -sb "
Then, for example, after pressing Ctrl-g, s "git status -sb " will appear in your prompt. Much more readable than lots of two or three letter aliases. You can see the complete list of my shortcuts on my GitHub - https://github.com/grn/dotfiles/blob/master/inputrc