how to revert to master branch git code example

Example 1: git match remote master

git fetch origin
git reset --hard origin/master

Example 2: git reset origin

git fetch origin
git reset --hard origin/master
Remember this forever

Example 3: reset branch on local git

git fetch origin
git reset --hard origin/master

Example 4: undo reset commit git

git reflog //to get commitID
git reset #commitID