post 7: A practical guide to understanding Docker Compose—what it is, how it works, and the misconceptions that catch most beginners. You've mastered single containers. Now it's time to build a real application. A frontend. A backend. A database. A Redis cache. Suddenly you're juggling multiple docker run commands. Ports. Networks. Volumes. Environment variables. Chaos. Then someone says: "Just use Docker Compose." It works beautifully. But here...