Famed short-seller Andrew Left lays out his methodology for finding the stock market's weakest links — and says he's terrified of newbie day-traders that think they can outsmart Carl Icahn and Warren Buffett

· Citron Research founder Andrew Left says that understanding the reasons people buy a stock is critical to his process of betting against it.
· Left also tells Business Insider that he's not shorting a lot of soaring "work from home" stocks in spite of their big gains because it's simply the wrong time.
· He's concerned...