Mark Cuban busts 3 of the biggest myths about what it takes to be successful in business

Mark Cuban, owner of the Dallas Mavericks, reacts during a play against the Chicago Bulls at American Airlines Center on January 23, 2015, in Dallas.
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After graduating from Indiana University, Mark Cuban moved into a three-bedroom "dump" with five friends and worked as a bartender to make ends meet.

At age 32, he reached millionaire status when he sold his first company, MicroSolutions, and at age 40, he joined the billionaire club after selling his second company, Broadcast.com. Today, the entrepreneur owns the Dallas Mavericks and has an estimated net worth of $3.3 billion.

According to the self-made billionaire, following your passion is overrated.

At a day-long conference last week in San Diego sponsored by Clever Talks, Cuban exposed three of the biggest misconceptions about running a successful business, reports Lori Weisberg of The San Diego Union-Tribune.

Mark Cuban: If I lost everything and had to start over, here's what I would do
Mark Cuban: If I lost everything and had to start over, here's what I would do

Myth 1: You need to raise a bunch of money after you come up with an idea

Rather than focusing on funding, focus on sales, the billionaire advises: "In every business, sales cure all."

Self-made millionaire Grant Cardone shares that philosophy. Above anything, focus on earning, he tells CNBC: "People get rich because they produce revenue, not because they make little investments over time."

Myth 2: You need to find a mentor

"I'm not Mr. Mentor," says Cuban. "A lot of people looking for mentors think, 'Here's the magic dust.' Just get out there and sell something."

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Myth 3: Following your passion is a recipe for success

This mainstream career advice won't necessarily lead to success, Cuban says: "Ask yourself, 'What do I have that makes it a no-brainer for people to buy from me?' If your answer is, 'I'm passionate,' you're in trouble."

He's not the only one to say you "do what you love" is bad advice. As CEO of MailChimp Ben Chestnut tells The New York Times: "It should be, 'Love what you do.' Take the job, learn to live in the moment and love it, master it, and doors will open for you if you're good at what you do. Turn it into a passion if you can."

Read the full San Diego Union-Tribune article here.

Mark Cuban's 3 tips for success
Mark Cuban's 3 tips for success