I met Mark Cuban before 'Shark Tank,' and he became my mentor. Here are the best business lessons he taught me.

I met Mark Cuban before 'Shark Tank,' and he became my mentor. Here are the best business lessons he taught me.

Entrepreneur Shira Lazar calls Mark Cuban the nicest billionaire she knows.Jon CaterEntrepreneur Shira Lazar said Mark Cuban became a true mentor after CBS News dropped her show.Lazar said Cuban's encouragement helped her to see herself as a startup founder.She said Cuban's advice led her to consultant work and has helped her become an AI thought leader.I first met Mark Cuban on a red carpet for a movie premiere I was covering as a young enterta…