Business

I know. Business.
Yecchh. I just threw up a little bit in my mouth.
Not.
Business, for me, was a fun game, a game to be played while I became an artist. An artist in the field of photography.
But to be successful, you must know your business intimately. It's a lot more important than going to some workshop in order to learn to move your key light one more damned inch higher.
Intimately. Every penny. Every average. I knew in my head whenever an employee made a mistake on the computer, when my accountant made a mistake on his books. "Here's a wrong answer," I'd often say, "now go back and find the mistake."
Don't depend on others for the answers.
Don't make others responsible for your success.
Don't put others in charge of your money.
Those who do usually end up in the news.