Comment by koolba

> The only time it flirts with complexity is multi-stage Dockerfiles, but 90%+ of Dockerfiles are a single stage.

And multi stage builds are just a directed graph short hand for having separate intermediate dockerfiles. There’s nothing special about them either.

If I had to pick one thing that is tricky for someone new to docker to understand, it’s how the filesystem state is cached using the previous state, the env, and the raw command text.