By any reasonable measure, the recent financial crisis qualifies as the most jarring financial event since the Great Depression, and it has drastically altered the way we think about many aspects of investing, especially leverage, liquidity, and transparency. But the central tenets of successful investing remain as valid today as they were before the crisis: 1. Diversify, 2. Eliminate unnecessary expenses, 3. Respect the micro-efficiency of market, 4. Manage the macro-inefficiency of markets.