Book excerpt: This guide explains not only how to invest in Fidelity funds but also the methods used today for managing Fidelity fund investments. It shows you how to decide which ones to buy and sell, and when. The safety inherent in each fund's diversification offers the advantages of trading individual securities without any of the disadvantages; switching assets between funds is quick and easy, and the trading costs are essentially zero. The Guide clears up some popular misconceptions about investing with Fidelity and offers sound advice on how to avoid common pitfalls. Using the techniques described here, one should be able to beat the market by an average of 10-15 percentage points per year, without assuming more than market-level risk.