Before creating a new branch, pull the changes from upstream. Your master needs to be up to date.

git pull





Create the branch on your local machine and switch in this branch :

git checkout -b name_of_your_new_branch





Push the branch on github :

git push origin name_of_your_new_branch





You can see all the branches created by using :

git branch -a





Update your branch when the original branch from official repository has been updated :

git fetch name_of_your_remote





Then you need to apply to merge changes if your branch is derivated from develop you need to do :

git merge name_of_your_remote/develop





Delete a branch on your local filesystem :

git push origin :name_of_your_new_branch





To force the deletion of local branch on your filesystem :

$ git branch -D name_of_your_new_branch





Delete the branch on github:

git push origin :name_of_your_new_b