You must fetch origin to get all of the remote branches that are available. To fetch origin simply move to your working directory and type:
git fetch origin
The easiest way to get the remote branch is by checking it out. To do so simply type:
This will checkout the remote branch called branch_name into a local branch with the same name.
git checkout -b branch_name origin/branch_name
If you found this guide useful, you may also be interested in our guide on how to commit and push in Git.