Please ask your son "what phases of the game" would he like to learn.
The player should talk to the coaches. This is "self-development"
1. How do I handle the "cut off", the bunt situation, the short fly ball.
2. what adjustments do I make when I am batting?
3. What adjustments do I make when I am pitching, fielding, sliding.
4. What is the coaches strategy early in the game, late in the game.
5. How can I learn to "read the bat".
6. If I am "pick off" 1b, do I go into 2b standing or sliding?
7. How do I read the outfield fence [angles] and the entire ball park.
8. Why should I keep a "diary" on every pitcher if I am a hitter.
9. If I am not playing today, how do I keep myself focused.
10.Every minute know the score, the # of outs and the inning.
We have a Mariners "playbook" with 20 times this info.
Bob