The Greatest Asst. Coach
One of the best tips on being a great assistant coach is to STFU and do as you are told. After that, I would say be the greatest recruiter out there to find the talent and potential to come to your school. Next is being extremely knowledgeable in your area of expertise and can convey those principles to your athletes that are under your direction. Coach those same athletes in a way that prepares them for performing very well at the conference and national championships.