A life partnership is a learning experience. We are constantly learning the ways we were wrong, and the ways we can be better, kinder, more patient, more empathetic, more respectful and more appreciative. Indeed, such a partnership is perhaps the most educational and most humbling experience most of us will have in our lives. The goal of this guide is to provide a practical summary of the science of romantic relationships. In addition to the evolutionary origins of the emotions that make relationships at once so challenging and so nourishing, it presents the skills and patterns that predict positive outcomes in relationships. Most importantly, the guide discusses how to implement this information, which can only be effectively applied in the context of the appropriate attitude. That attitude is, "I'm never perfect, never done growing, and neither is my partner. But I'm always growing, and so is my partner, so we're exactly where we need to be."