Care about your customers more than about yourself, and you'll do well.
The most important lesson is probably to spend less than you earn.
Make every decision—even decisions about whether to expand the business, raise money, or promote someone—according to what's best for your customers.
You can't please everyone, so proudly exclude people.
Repeated psychology tests have proven that telling someone your goal makes it less likely to happen.
Pay close attention to when you're being the real you & when you're trying to impress an invisible jury.