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Hi. Almost everything in the book is still applicable. You would probably have a Debian based-distribution there, but if you already use APT, there is no trouble switching from DNF. Debian is systemd based so most things apart from package manager apply.

I don't talk about on-premise specifically, but if you control your router, you can open specific ports and forward them. You might want to make sure your Raspberry has a static IP (and not dynamically assigned).