Makes sure your (local) repo is updated

git pull origin develop

Creates a new branch for you to work with

git checkout -b "nombre de tu rama" ex: New_navbar

Once you re done, add all changes you want to commit

git add .

Commit the changes

git commit -m "add : " / "fix : "

Updates the changes in your branch

git push origin turama

Change to the master branch

git checkout develop

Makes sure your (local) repo is updated again (in case there are new changes while you were editing your branch)

git pull origin develop

Change to your branch

git checkout tu rama

Make your branch at the same "timelapse" than the newest master

git rebase develop

Change to the master branch

git checkout develop

Merge your branch and the master branch

git merge tu rama

Updates the github repository with all your changes

git push origin develop