For us the most important of the above 10 points are:  1) Markets tend to return to the mean over time : Sharp market rally (upswing) and sharp decline are temporary. Be cautions and invest. 2) Any "Excess" (either upward or downward) are never permanent. 3) Public buys more at the top and least at the bottom : Never be this 'public', do the opposite, be a value investor. 4) Fear and greed are stronger than long term resolve : As long as there is fear and greed in the market you will see the ups and the downs (volatility). Trading for shorter terms will always result in losses. Long term shall serve you well. Stay persistent and invest small amounts regularly.