This document is a guide that outlines the critical elements of API discovery, testing, and continuous monitoring within the context of F5 Distributed Cloud API Security. It explains the importance of API visibility and the need for organizations to manage their APIs effectively as they integrate numerous internal and external APIs into their applications. The guide details various discovery mechanisms, including code analysis, traffic-based discovery, and intelligent web crawling, which together help organizations maintain a comprehensive understanding of their API endpoints and associated risks. It emphasizes the necessity of early visibility in the software development lifecycle to limit exposure to vulnerabilities and sensitive data. The document also presents key features of the F5 solution, such as automatic API documentation, sensitive data detection, and rich monitoring capabilities, which collectively enhance security measures and streamline API management. By adopting these practices, organizations can mitigate risks associated with API vulnerabilities and ensure robust security across their digital ecosystems.