In practice, don't just run basketball drills, teach the players how to play basketball.
Go from good to great because good is the enemy of great.
Your program must have an overriding purpose which is clearly visible and which teaches lessons beyond winning.
Proper prior planning prevents pitiful poor performance.
When I go in for heart surgery, I want a full-time surgeon. I don't want some guy who just does it part-time between rounds of golf. You want a guy who is doing it all the time and is always reading and learning about the most recent techniques.
Study people who can teach you how to deal with people.