There's no question that hitting a moving round ball with a moving round bat is very difficult to do well. Yes, there are a few key things your kid needs to do to succeed with the bat. Most importantly, don't over complicate this for kids and teens! There are tons of "experts" out there that try to teach things many kids just can't comprehend and repeat.
This video is a treat to watch. Make sure to have your kid watch! Enjoy.