Stash
You are in the middle of a change (some files have changed in your working directory) when you suddenly think about some refactoring to be done. How to save the local changes easily?
Change some files locally
$ git stash # saves all the changes and leaves the directory clean
Saved working directory and index state WIP on main: 6217360 last-commit
HEAD is now at 6217360 last-commit
$ git stash list
stash@{0}: WIP on main: 6217360 last-commit
Make some other changes, add and commit them
$ git stash pop # will merge the stashed changes