The idea here is that you want to keep your branch super fresh with the latest updates... (some use master, others create a new branch called dev or staging)
git checkout master && git pull origin master
git checkout branch-name
git rebase master
git push origin :branch-name
git push origin branch-name
Make sure branch-name is up to date as well. If you have changes you don't want to commit yet, then do a git stash