I don't know everything about anything. And like most coaches, I've heard that I know and taught nothing. Yogi Berra said, "sometimes you can see a lot by just looking." Here are some observations I have about good coaching.
"Do more of what works and less of what doesn't."
What we think they know and what they know can be oceans apart.
Best is often when you cannot reduce a concept any further. You may not be able to defend the pick-and-roll one way. But you won't be able to defend it eight ways.
Resist the temptation to complicate matters unnecessarily.
Safeguard a positive culture.
"Leverage your strengths."
"The more aggressive team will generally succeed."
"How will you wear down and wear out your opposition?"
"No great player is a bad teammate."
Don't be a jerk. Give respect to get respect. Fairness matters.