The pieces you picked up scattered across the week — the isolation model of ECS and Fargate, CloudFormation's declarative engine, SAM's macro, CDK's synthesis, and the coupling principles of serverless architecture — are really just different answers to one large question: "How do we get containers and functions running on the cloud safely and repeatably, without a human clicking through a console?" This review is not a re-listing of individual facts. The goal is to thread those facts onto a single line of reasoning about why they were designed that way, so that a reworded question on exam day doesn't shake you.
The container and IaC area of DVA-C02 is a major pillar of the Deployment domain