git pull wants you to either remove or save your current work so that the merge it triggers doesn’t cause conflicts with your uncommitted work. Note that you should only need to remove/save untracked files if the changes you’re pulling create files in the same locations as your local uncommitted files.
Remove your uncommitted changes
Tracked files
git checkout -f
Untracked files
git clean -fd
Save your changes for later
Tracked files
git stash
Tracked files and untracked files
git stash -u
Reapply your latest stash after git pull:
git stash pop