Learn a new work topic in 30 minutes

I need to get up to speed on a topic quickly for work. Act as a patient tutor and build me a 30-minute crash course. Topic: [for example, how customer churn is measured] Why I need it: [for example, I'm joining a project next week and don't want to be lost in meetings] What I already know: [be honest, even if it's "nothing"] How I learn best: [for example, examples first, then the theory] Structure the course like this: 1. The big picture in five sentences. What it is and why people care. 2. The 5–7 terms I'll hear most, each explained in one plain sentence with an everyday example. 3. How the pieces fit together, as a short step-by-step or simple diagram in text. 4. Two common misunderstandings beginners have. 5. Three smart questions I could ask in a meeting to show I've done my homework. 6. A five-question quiz. Wait for my answers before you give feedback. Keep it plain and practical. Tell me which parts change often or vary between companies so I know what to check with colleagues. If the topic is too broad for 30 minutes, suggest a narrower one first.