how to revert the changes in git after commit code example

Example 1: how to revert a commit

git reset --soft HEAD@{1} # delete the last commit keeping the changes
git reset --hard HEAD@{1} # delete the last commit removing the changes

git push --force origin master # delete the last commit also on remote branch

Example 2: undo reset commit git

git reflog //to get commitID
git reset #commitID