Mark Cuban Reveals the Best Side Hustle, In-Demand Job Skills and Traits of Highly Successful People

Mark Cuban knows what sets successful people apart from the crowd. Cuban, 66, is both a self-made billionaire and a longtime startup investor who’s listened to many business pitches in more than a decade on ABC’s “Shark Tank” and mentored dozens of entrepreneurs he’s helped fund. The core traits and strategies that make people successful haven’t changed since Cuban first got started.