I think the key thing for a university student is to get the big ideas down: what is a container exactly, how does it work, how does it differ from a VM, what assumptions does it make about what you're running (and how do you run something that doesn't fit that pattern), why do images exist in layers and how are layers implemented, what are the performance benefits/tradeoffs, etc. etc.

When I was learning Docker I can't tell you how many people would describe it to me by analogy to a standardized shipping container, and start going off about shipping container dimensions and supersized cargo ships and trucks and railcars... and finish by smiling beatifically, like they had just explained the whole thing in a masterstroke. Let's... uh... not do that. :-D

In a problem set, the student might learn a bit about dockerfiles or docker-compose.yml... but only, I think, so they can try building and running a container of their own!