We often get the question "Am I a right or left shooter" and "what is the difference"?
You are a right shooter when the rifle is on the right side (shoulder) of the body and the right hand will pull the trigger while the left hand is supporting the rifle.
You are a left shooter when the rifle is on the left side(shoulder) of the body and the left hand will pull the trigger while the right hand is supporting the rifle.
If that still sounds too complicated - just remember which hand you're using for pulling the trigger!