Git, a powerful version control system, provides various methods to "undo" changes, catering to different scenarios that users might encounter. For reversing a public commit already pushed to a repository, one can use the `git revert` command, which creates a new commit to negate the changes of a previous one without altering the commit history. If a commit message needs correction before pushing, `git commit --amend` allows users to modify the most recent commit, including its message. Local uncommitted changes can be reverted using `git checkout -- <filename>`, but this permanently discards the changes. For undoing recent local commits, `git reset` can rewind the repository's history, with the `--hard` option also discarding changes in the working directory. If users wish to recover changes after a hard reset, `git reflog` helps navigate the project's history to restore commits. Branch management and rebase functions allow users to reorganize commit history effectively, such as moving commits to a new branch or syncing with an updated base branch. Interactive rebasing (`git rebase -i`) offers granular control over the commit history, enabling users to squash, reorder, or omit commits. Lastly, to stop tracking a file mistakenly added to the repository, `git rm --cached` removes it from version control while keeping the local file intact.