It would be a wrapper: something like:

* git branch hidden current

* git do-the-command-here

* if we call git undo, checkout the hidden branch, otherwise delete it

In practice, I think a lot of people call `git lg` often enough that they can just git reset --hard to a recent commit hash, or they manually create a just-in-case branch if they're going to do something risky/dangerous.

Look at the last repository-altering operation you ran and reverse the effects of it. Add a --dry-run to see what it would do, and print out the command it runs as a way to teach people more advanced things about Git.

Microsoft Word has undo. Git can as well.

git reflog?

All of those need you to know what you’re doing and what exactly you want to undo