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Learning to set up a server help
(lemmy.world)
Linux introductions, tips and tutorials. Questions are encouraged. Any distro, any platform! Explicitly noob-friendly.
I agree with your first half, but regarding the second half I'd argue that docker isn't a necessity, especially early on. You can host multiple things fine without docker.
Docker is nice and all (or so I've been told), but I'd put that a lot further down on the list of things to learn. Understanding the basic services individually is more important than containerization.