I love baseball and I love coaching baseball. I know there are many ways to teach the skill of hitting. If you listen to speakers or watch some lessons most look the same. If you fix a few mistakes it will help a player become a better hitter.
The problem I have sometimes is kids trying to crush the baseball. This causes them to take a huge cut at the baseball. This causes the front shoulder to fly open to soon. This causes your head to pull off the baseball and you swing and miss or hit a weak ground ball. Teaching a kid to keep everything compact is hard to do. It takes practice to be a good hitter.
How can this be fixed? You have to make sure the hitter doesn't open up. Start with a old bat and a punching heavy bag or an old tire mounted about waist high. Set up in a regular hitting stance. Start with your chin place on your front shoulder. Keeping feet stationary begin to swing the bat hitting the bag or tire. Notice your hips and shoulder will rotate toward the impact zone at the same time. For the next 10 swings still leaving feet planted shift weight on back leg and then explode toward the bag. Next move to a batting tee with a deflated basketball on it. Know keeping your chin on your shoulder and in your normal stance, take your normal stride and hit the basketball. Keys to check:
Did my shoulder stay closed
Did my head stay on the ball
Did my hips stay closed
Everything should move the same time keeping elbows bent and close to body till contact.
Then repeat for about 10 swings. Finally place a baseball on the tee and continue to hit keeping all the keys in mind. A good thing to do is to get someone to video tape your swings and you can what yourself swinging. Believe me it is a big help to see for yourself what is happening when you swing.
In conclusion practice and hitting drills can only take you so far. If you want to be great you have to put in the work for yourself after practice is over. Study your swing, watch videos of other swings, study the game and become a student. You will see major improvement in your game. Keep the chin down and shoulder in and you will see a difference. Another good way to study your swing is by using the Zepp Baseball Swing Sensor.
Zepp 3D Baseball Swing Analyzer This could be one of the best new baseball inventions. The analyzer attaches to the knob of the bat and syncs with the app form the app store, or Google Play store to display your swings. Then gives you a break down of bat speed, bat angle, hand speed, attack angle, and time to impact. You cam also video your swing and compare it to the pros like Trout, Stanton, and Pence.