how to delete commits in git code example

Example 1: git clear commits

git reset --hard origin

Example 2: delete commit

git checkout master
git reset --hard e3f1e37
git push --force origin master
# Then to prove it (it won't print any diff)
git diff master..origin/master

Example 3: git delete commit 4785cd1e041

git reset --hard <sha1-commit-id>