Threat informed defense means using knowledge about real attacks to guide security work, so defensive choices stay connected to how adversaries actually behave in the world. For a beginner, this idea matters because it turns cybersecurity from a pile of disconnected tools into a story about attackers, their steps, and the ways defenders can interrupt those steps. In threat informed defense, the starting point is not a catalog of products or buzzwords, but a simple description of how someone might break into a system, move around, and reach something valuable. That description becomes a map that shows which defenses should exist, where they should sit, and which events defenders must notice quickly when something suspicious happens. Thinking this way keeps learning grounded in real attacker behavior instead of abstract checklists and slogans, which helps every new concept feel like another piece of the same overall picture. This episode uses that map based thinking to connect several popular models so a new learner sees how they support threat informed defense together.