This document provides guidance on conducting user research to validate a product idea. It emphasizes that qualitative user research is important to identify user behaviors, needs, and problems in order to reduce the risk of building the wrong product. It recommends understanding the problem from the user's perspective by asking "why" multiple times, conducting ethnographic research by observing users in their environment, and performing interviews without leading questions. The document also provides tips on recruiting test subjects, testing prototypes as early as possible, and tools for remote user research.