This document summarizes a presentation about building products users love through user feedback. It begins with an overview of the product manager role and product design process of starting with learning, testing early and often, and iterating after launch. It then provides a case study of Google Classroom, detailing how they learned teachers spend most of their time on non-teaching tasks, tested early prototypes with a small group, iterated based on feedback, and publicly launched in 2014 after an alpha and beta period to collect more feedback and continue improving. The key lessons are to start with user and market research, user test ideas early and often, and collect post-launch feedback to keep learning and iterating.