git checkout master means code example
Example 1: createa. branch off of development git
//when on branch 'dev' make branch 'myFeature' off of 'dev'
git checkout -b myFeature dev
Example 2: git checkout branch
truelover@PEACE project % git checkout master
truelover@PEACE project % git checkout branch_name
#create branch
truelover@PEACE project % git checkout -b new_branch_name