This document is a primer on exposure management metrics, outlining various metrics that organizations can utilize to analyze and guide their exposure management programs. It details operational metrics, decision-making metrics, and performance metrics that security teams and executives can use to enhance their cybersecurity posture. The primer explains how metrics such as attack surface visibility, assets under management, and exposure risk ratings can help security teams prioritize risks and communicate effectively with stakeholders. Additionally, it discusses the importance of cyber risk levels and annual loss expectancy in decision-making processes, providing methodologies for measuring these metrics. The document emphasizes the need for organizations to quantify their cyber risk and the effectiveness of their exposure management efforts, ultimately aiming to improve organizational support and investment in cybersecurity initiatives. By implementing these metrics, organizations can better protect themselves against cyber threats and improve their overall security strategies.