Cyber Threat Intelligence for Autodidacts

**Executive summary:** This guide introduces Cyber Threat Intelligence (CTI) fundamentals for analysts, covering career paths, core frameworks (Intelligence Lifecycle, Diamond Model, MITRE ATT&CK), and common CTI activities such as responding to RFIs, building threat actor profiles, managing IOCs, vulnerability and attack-surface monitoring, threat hunting, brand monitoring, and community engagement; it is a learning/resource oriented document and does not report a security incident.