docker run vs docker exec — new container vs existing one

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What this covers

The one distinction that trips up every beginner: `run` creates a new container, `exec` enters one that's already running.

1. The scenario: your web server is running; you want to look inside
2. The wrong reaction: docker run — creates a new container
3. The right tool: docker exec
4. In one line: run creates, exec enters
5. Common everyday uses of exec