I do want to wade into the details, so I'd put it more that I need to try many things, and by necessity I have to be a user before I can become an expert.

I know a good deal about how Docker works from having hammered at it. I'm not remotely an expert in it yet, but as I go I'm learning more details about cgroups and namespaces, and this is stuff I've been able to fit in while solving problems.