sample.txt

$ git log --oneline
09232b1 initial commit
f1edfaf initial commit
ddb9834 Initial commit
$ git checkout f1edfaf
Note: checking out 'f1edfaf'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b <new-branch-name>

HEAD is now at f1edfaf... initial commit
$ ls
index.html  main.js  README.md
$ git status
HEAD detached at f1edfaf
nothing to commit, working directory clean
$ git commit -m "reverted"
HEAD detached at f1edfaf
nothing to commit, working directory clean
$