I've cloned some project from github, to my project, all works good, I'm happy.
But after some git pulls I receive some conflicts in my project with new commits of upstream project.
I want to rollback to previous checkout, but i don't know which stable checkout was previous in my project.
How I can know it and rollback to previous stable (for me) project checkout? I understand that in perspective more correct way to fix my conflicts with upstream repo, but sometimes i just need rollback to previous version, to get time for fixing problem.