The book Buy--DON'T Hold: Investing with ETFs Using Relative Strength to Increase Returns with Less Risk by Leslie Masonson gives a great outline of and a case for making money and reducing risks with exchange traded funds. His Six Step Road to Success is very clear and easy to understand.
He recommends ignoring Wall Street experts and avoiding mutual funds, and spells out many reasons for using ETFs instead. He covers the various stock market indictors that should be utilized and provides several very useful web sites that can be used as resources. If you want to increase the return on your portfolio and lowering your risks, get the book Buy--DON'T Hold