how to undo git pull request code example

Example 1: undo git pull

git reset --hard master@{"10 minutes ago"}

Example 2: how to reverse a git pull

git reset --hard master@{"10 minutes ago"}

-----------------------------------------

git reset --keep HEAD@{1}

Example 3: git revert pr merge

git revert -m 1 b76a5f1f5d3b323679e466a1a1d5f93c8828b269 (Commit Number)