Warren Buffett: You Only Need To Know These 7 Rules BySteve Burns Too many times investors and traders start and stop what they think are great ideas in theory but aren’t so great in practice. Investors may bet on 20 great ideas in their life-if they even have that many-and assume they will make money, but this could be a mistake. Buffett says “three or five or seven” might make you wealthy, “bu..