how to checkout a previous commit code example

Example 1: git tag a previous commit

git tag -a v1.2 9fceb02 -m "Message here"

Example 2: 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 3: git pull from previous commit

git checkout -b old-state 0d1d7fc32