I will break answer on three paragraphs.
Part 1:
git stash (To save your un-committed changes in a "stash". Note: this removes changes from working tree!)
git checkout some_branch (change to intended branch -- in this case some_branch)
git stash list (list stashes)
You can see:
stash@{0}: WIP on {branch_name}: {SHA-1 of last commit} {last commit of you branch}
stash@{0}: WIP on master: 085b095c6 modification for test
git stash apply (to apply stash to working tree in current branch)
git stash apply stash@{12} (if you will have many stashes you can choose what stash will apply -- in this case we apply stash 12)
git stash drop stash@{0} (to remove from stash list -- in this case stash 0)
git stash pop stash@{1} (to apply selected stash and drop it from stash list)
Part 2:
You can hide your changes with this command but it is not necessary.
You can continue on the next day without stash.
This commands for hide your changes and work on different branches or for implementation some realisation of your code and save in stashes without branches and commitsor your custom case!
And later you can use some of stashes and check wich is better.
Part 3:
Stash command for local hide your changes.
If you want work remotely you must commit and push.