What makes a good coach good and a bad coach bad?

Good coaches teach fundamentals, team concept, and develop young players.

At the youth level FUNdamentals should come first. You need the fundamental skills to understand & execute team concepts. Your new HS coach won't care how your kids youth team did, however the HS coach will care about fundamental skills, attitude, work ethic and hopefully academics. A kid with those qualities will be ready to fit into the HS program and have the tools to run the team plays the coach wants.

Losers give it their best, but winners succeed. That's what all coaches strive for. While winning isn't everything, too much losing isn't very rewarding either. A good coach has to understand a player's weaknesses and strengths. Good coaches understand and motivate their players. That motivation doesn't always come through positive means; sometimes it takes some negativity to understand the lesson.