how to go back to my last 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: git go back to previous commit

git checkout 12feg3435 #commit ID

Example 3: git move back one commit

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