how to revert back in remote to previous commit code example

Example 1: git reset remote

# local
git reset <commit-hash>
# or
git reset --hard <commit-hash>

# remote
git push -f origin master

Example 2: git remove commits from branch after push

git reset --hard <last_working_commit_id>
So we must not reset to the commit_id that we don't want.

Then sure, we must push to remote branch:

git push --force