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Revert vs. Reset
git reset --soft: Undo commits but keep changes stagedgit reset --hard: Undo commits and discard changesgit revert: Create a new commit that undoes a previous commit
When to Reset
If you're working on your own branch, and you're just undoing something you've already committed, say you're cleaning everything up so you can open a pull request, then git reset is probably what you want.
When to Revert
However, if you want to undo a change that's already on a shared branch (especially if it's an older change), then git revert is the safer option. It won't rewrite any history, and therefore won't step on your coworkers' toes.