The investor and owner of the Dallas Mavericks tells Business Insider the best advice he ever got was: "Do the work. Out-work. Out-think. Out-sell your expectations. There are no shortcuts." The advice came from his father, who did upholstery on cars, when Cuban was in high school. "He was always very encouraging but also realistic," Cuban says of his dad.

Other good advice from the article:

1. You’re the average of the five people you associate with the most.

2. Keep it simple. 

3. Learn to say no. 

4. Being comfortable is the enemy. Staying hungry forces you to push yourself to continue to survive, grow, and evolve.

5. Don't give up.