This document discusses investing strategies and techniques supported by research, including the efficient market hypothesis and modern portfolio theory. It recommends investing in low-cost index funds or ETFs within a diversified asset allocation according to one's risk tolerance. Beating the market long-term is difficult, as only 30% of professional investors do so, and few repeat it year over year. The document provides tips on separating investing noise from proven approaches and staying disciplined by not trying to time the market.