It's really handy to be able to see the current git branch in your shell prompt along with the directory name. This for a start removes many "git branch" commands from your history.
To enable this feature, you have to edit your .bashrc file on Linux or the .bashprofile on Mac. These files usually exist in your home directory (The default directory when you open a shell) and are executed when the shell logs in. You can edit this file with any text editor such as Gedit or Textmate.
Add the following 2 lines after any existing SP1 variables and then save your file. Open a new shell to see the changes.
export PS1='[\033[1;36m]\u at[\033[00m] [\033[34m]\W\[\033[31m]$("gitps1")[\033[00m] > '
If you would like to update the colours of the prompt, then visit this article to get a grasp of the basics and you can find much more on Google from there.