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Success doesn’t happen by accident.

To prove it, look no further than some of the most powerful people in business: Facebook CEO Mark Zuckerberg, COO Sheryl Sandberg, Amazon CEO Jeff Bezos, and billionaire investor Mark Cuban.

We compiled some of these leaders’ best habits — and one bad one, for good measure — to help understand how they got where they are today.

Read for the best and worst habits of these successful people:

SEE ALSO: 15 habits of self-made millionaires, from a man who spent 5 years studying rich people

DON’T MISS: 9 things rich people do and don’t do every day

Mark Zuckerberg is famously frugal

Mark Zuckerberg is worth more than $50 billion, but he certainly doesn’t flaunt it.

Although he could afford any car he wanted, Zuckerberg drives a black Volkswagen GTI with a manual transmission worth $30,000.

He married his wife Priscilla Chan in their backyard, and on their honeymoon in Italy, the two were seen eating at a McDonald’s.

And then there’s his famous uniform of a gray T-shirt and jeans. It’s not quite as frugal as it looks — each T-shirt reportedly costs upwards of $300 — but it’s still considerably less expensive than the wardrobes of some of his billionaire peers.

Zuckerberg sets challenges for himself

Zuckerberg has made an annual tradition of setting a challenge for himself to complete in the coming year.

His previous challenges have included running a mile every day, reading a new book every two weeks, learning Mandarin, and building an AI for his home.

But he has at least one bad habit: The first thing he does every morning is check his phone

Zuckerberg routinely checks Facebook, Messenger, and WhatsApp first thing in the morning.

You might excuse the CEO, seeing as he owns the company behind the apps, but Read More Here