Annotated excerpts:
The most important aspect of any defense is communication.
Don't assume your kids know your basketball terminology -- even multi-year returners. Giving and getting feedback is critical.
Three rules of his defense: 1. No layups; 2. Contest all shots; 3. No second shots. No easy baskets.
Don't defend non-penetrating passes, i.e., passes that go away from the basket. Conversely, defend all penetrating passes.
When you double the post, the shot will come from the opposite corner. I've diagrammed one possible way that happens.
In transition defense, force the offense to make one more pass. One more pass allow defense to get back and engaged.