how to revert back changes in git code example

Example 1: git undo pushed commit

git reset <previous label or sha1>
git commit -am "commit message"
git push -f <remote-name> <branch-name>  //  git push -f origin master

Example 2: revert to commit git

# This will detach your HEAD, that is, leave you with no branch checked out:
git checkout 0d1d7fc32