You don't need to be an expert in order to achieve satisfactory investment returns. But if you aren't, you must recognize your limitations and follow a course certain to work reasonably well. Keep things simple and don't swing for the fences.
Warren BuffettThere are all kinds of businesses that Charlie and I don't understand, but that doesn't cause us to stay up at night. It just means we go on to the next one, and that's what the individual investor should do.
Warren BuffettI read annual reports of the company I'm looking at and I read the annual reports of the competitors - that is the main source of material.
Warren Buffett