I found thst ZFS to be very simple to understand, everything is controlled by just two commands. Datasets are huge win over partitions which seem like such a weird relic of the past once you have tried datasets. Fairly confident you can grasp ZFS in a hour or 2, you can even make a zfs pool from files to mess around with.
I never found a good non-tutorial introduction into ZFS concepts. Do you know any? By non-tutorial, I mean something that doesn’t focus on teaching you the command-line tooling. Like you can explain to someone how Git works conceptually in detail, without having to mention any Git commands and having them exercise some Git workflow hands-on.
There really isn't many concepts to get. `zpool` is like the device manager, use it define how your disks are grouped i.e. turn two disks into a mirror or striped array. `zfs` creates, sets properties on and manages the datasets on the zpool.
I reccomend you just play around with it a bit first (you can just use some 1Gb test files instead of actual disks), its really just a lack of familiarity that scares people away.
I have seen those, yes. These are reference materials, not an introductory presentation that explains the concepts and their relations, design rationale and use cases in context.