“Invest in what you know.” It’s a simple concept. It seems safe. And hey, Warren Buffett stands by it. So it must be good advice, right? But there are no guarantees in investing — even when you stick to products and business models that you’re familiar with. So should investors really only stick to what they know? In this episode of Angel Insider, Allison Brickell and Vin Narayanan discuss the pros and…