I mean, obviously this guy did really well in the stock market. This is the fourth question I have answered like this, so I definitely say yes. He has a lot of money, and obviously has stock market experience so I think we could learn valuable lessons from him on the stock market.
Derek Jeter probably has many investments in the stock market and a basic knowledge of stocks. However his investments are undoubtedly managed by a financial adviser. Derek Jeter would not be able to offer extensive, valuable lessons in the stock market. He is in no way an expert in the subject.
Derek Jeter while a very wealthy man hasn't entered the Wall St arena just yet. While his advice pertains to the market, Don't swing for the fences, Don't panic in the fall and Strike a balance, he is referring to baseball. Sound advice for any individual, market player or not.
I'm not a stock market person but if my memory is correct Derek Jeter is an athlete not a person in the finance industry. Personally I wouldn't take stock market lessons from a athlete. I'd be hard pressed to take financial advice from an actual financial adviser. I have my doubts Jeter could say much about the stock market that would be worth while.