The document discusses different types of API approaches, including utility APIs which are built to be used, and ecosystem APIs which are built for others to build upon. It recommends creating a partner program when partner market fit is found. It advises knowing what can be offered to partners and investing in channels partners care about to encourage partners to build on a platform. Metrics for measuring platform success include app creation, consumption, engagement, user value, and acquisition via partners. Partners should be supported through active management and maintaining relationships after launch.