I don't watch high school basketball. I do watch the video clips of the players with whom the Hawks are interested. It certainly appears that the hs game is offense oriented. That is where the attention lies. Nobody really watches the highlight video to observe defensive prowess. Occasionally a highly ranked player will block a shot or intercept a pass, but the emphasis is on what he does offensively after the steal or block.....
Nonetheless, D can be taught. It is not really that difficult. It is rather basic. Stay in front of your man with a wide stance, preventing him from driving by you. Keep your hands near the ball, follow the ball everytime he shifts it. Play your opponent close. When he attempts a three, be right there with your hands in his face, in front of the ball, hopefully preventing a clean shot while interfering with his point of view.....
Rather simplistic, and only refers to perimeter play. That is how I played in another dimension, eons ago.....
I did have the ability to knock the ball away from the opponent when he started his dribble. Usually I slapped the ball out of bounds off his legs.....
Not certain if that strategy will work these days, players being Allen Iverson like and all....