Last week, I started a new investment series called “Build an Investment Strategy”. All my readers have made at least one trade in their broker account, but it doesn’t mean they have a solid investment strategy. It goes far beyond a simple set of ratios and metrics that you enter into a stock filter. An investment strategy is your philosophy; it describes the way you intend to manage your portfolio. The investment strategy is useful when you are about to make a tough decision: to buy or to sell.