Hi Mizhael, Just hit on these two great videos on risk and portfolio management: <a href="http://www.youtube.com/watch?v=UkwVRZ_KLlk">Risk management</a> <a href="http://www.youtube.com/watch?v=5CToJunoTNs">Portfolio Risk management</a> Tutorial on Kelly Criterion if you want to optimize your portfolio (read this if you already understand the above two basic videos): <a href="http://www.stock-trading.me/2010/03/kelly-criterion-investing-calculator-and-strategy/">Kelly Criterion Investing: Calculator and Strategy</a> Good luck!