how to take checkout of a branch in git code example

Example 1: git checkout to remote branch

$ git checkout --track origin/newsletter
Branch newsletter set up to track remote branch newsletter from origin.
Switched to a new branch 'newsletter'

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