This document provides guidance on understanding buyers to increase sales. It discusses conducting market research using tools like Alexa and Quantcast to understand competition, trends and audience demographics. The 3 main reasons people buy are to make money, save money, and alleviate pain/suffering. Products should fulfill one of these needs. Tracking results through Google Analytics and heat maps shows which pages/elements perform best. A/B testing compares two variants like headlines to see which performs better. Understanding buyers allows creating popular, high-selling products that position one as an industry leader.