how to de-commit on terminal code example

Example 1: undo commit

# KEEP CHANGES
git reset --soft HEAD~1

# REMOVE CHANGES
git reset --hard HEAD~1

Example 2: how to uncommit my last commit in git

git reset --soft HEAD^

git reset HEAD^
//And if you actually want to completely undo it, throwing away all uncommitted changes, resetting everything to the previous commit (as the original question asked):

git reset --hard HEAD^