As devs, do you learn the ins and outs of using Docker with your normal toolset or rely only on working examples and boilerplate you find online?

I know this probably seems weird to ask about such a universally-known tool as Docker. But being someone who has little time to myself, it's a pretty big question.

I'm also currently using Lando as much as I can; it's a nice abstraction. But I still occasionally run into use cases that make me wish I knew Docker.