This document summarizes lessons learned by Adam Nash over 20 years of product management experience. It discusses that product managers are judged by their products' results, not their authority. It also discusses prioritizing features into three buckets: metrics movers to drive revenue, customer requests to maintain trust, and delight features to inspire loyalty. Great products combine all three. Understanding what drives virality and engagement is also key. Product teams should focus on reducing friction but also increasing desire. Simplicity is important - products should do the core job simply without extraneous features. A great product leader focuses on behavior, values, and continuous learning as products are never truly finished.