gitSync

getting an up-to-date upstream:
  git checkout master
  git pull upstream master
  git push origin master

making a new branch called 'new_branch_name':
  git checkout master
  git checkout -b new_branch_name

switching to an existing branch called 'some_branch_name':
  git checkout some_branch_name

staging changes to a new branch:
>> to stage removal of a file named foo.txt:
    git rm foo.txt
>> to stage addition of a file named foo.txt:
    git add foo.txt
>> to stage addition of all new files:
    git add .

to commit staged changes to a branch:
  git commit -m "a helpful message"





getting an up-to-date branch:
git fetch <remote>
git checkout <remote>/<branch>