Experience is known to be one of the best ways to learn, but there is such a huge importance for beginner entrepreneurs to take in all the knowledge they can find, especially from the professionals themselves.

You can guarantee that any problem you have or will face in the future as an entrepreneur has already been experienced by an entrepreneur before you. These following pieces of advice are supplied from the pros themselves to help entrepreneurs stay true to their goals and never give up.

1. Mark Cuban

Mark Cuban is the owner NBA’s Dallas Mavericks, Landmark Theaters, Magnolia Pictures, and is also the chairman of the HDTV cable network AXS TV. He is also a featured investor on ABC’s Shark Tank. The following is one of his strongest pieces of advice:

“Then, taking that first step is always the hardest. It’s terrifying, but really, it’s about preparation. We all go through this process where you’ve got the business idea, you get that feeling in your stomach and you get all excited. Then you talk to a friend, and your friend says, ‘oh wow that’s pretty cool, I’ve never heard of anything like that. I’d buy that.’ And then you do the Google search.”

2. Robert Herjavec

Robert Herjavec is an experienced entrepreneur who’s both built and sold major brands such as AT&T. He is also one of the most recognized faces on ABC’s Shark Tank. Who better to learn from when it comes to pitching your ideas to investors than from an actual investor? He has offered up one of his best pieces of advice when it comes to pitching your ideas to investors:

“You have 90 seconds, if you’re lucky. If you can’t make your point persuasively in that time, you’ve lost the chance for impact. Facts and figures are important, but it’s not the only criteria, you must present in a manner that generates expertise and confidence.”

3. Sophia Amorusa

Sophia took the company Nasty Gal from a store that was featured on eBay and made it into a multi-million-dollar empire featuring even her own clothing line which was dubbed the fastest growing retailer back in 2012. The following is one of the best pieces of advice she has ever given:

“Don’t give up, don’t take anything personally, and don’t take no for an answer; you never know what you’re going to learn along the way.”