revert code by commit id on git code example

Example 1: after checking out a previous commit go back to latest commit

git checkout <commit hash>	# go to previous commit
git revert <commit hash>  	# revert action of going to previous commit

Example 2: git pull from previous commit

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