Industry standard version control.
Stash is a good way to save changes before committing them if for example you want to change branches or merge something new into the branch you are working on. Think of git stash as a separate storage place to temporarily store your changes.
Store changes in stash
git stash
Retreive latest changes from stash
git stash pop
Retreive specific changes from stash
git stash pop stash@{index_number}
git stash pop stash@{1}
List changes in stash
git stash list
Show the most recent stash
git stash show -p
Stash single file
git stash -- filename.txt
git rm -r --cached .
git add .
git commit -m 'clear git cache'
git push
http://caseyscarborough.com/blog/2013/08/25/pushing-to-multiple-remotes-using-git/
http://www.codeblocq.com/2016/01/Untrack-files-already-added-to-git-repository-based-on-gitignore/