Warren Buffett's 8 Key Tips for Investors Include Holding Cash, Being Patient, and Treating Shares as Owning a Business, a New Study Finds (Business Insider) Warren Buffett 's key lessons for investors include keeping cash on hand, treating shares as pieces of a business, and reining in emotions, according to a recent academic study. The billionaire investor and Berkshire Hathaway CEO has publicly discussed numerous investing concepts over the years. Dr. Christian Koch identified eight critical ones in "Warren Buffett: A Practical Understanding of Financial Literacy Extended to Managing Investments," an analysis he conducted for a doctoral dissertation project at University of South Florida, Tampa.