how to revert a commit in git which has not pushed code example

Example 1: github undo last pushed commit

git reset <previous label or sha1>
git commit -am "blabla"
git push -f <remote-name> <branch-name>

Example 2: how to revert last pushed commit

To reset a brancj to some good commit:

In the server, move the cursor back to the last known good commit:

git push -f origin <last_known_good_commit>:<branch_name>

Locally, do the same:

git reset --hard <last_known_good_commit>
#         ^^^^^^
#         optional