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Best OS for use in newly acquired server
(alien.top)
Proxmox is likely what you are looking for. You can find guides on how to use it online.
I am currently using TrueNAS Scale on a small NAS. It is used for both basic storage and hosting services like Jellyfin. It was easy to set up and is simple to manage. So far I'm pretty happy with it. It's not so friendly for customisation but that's a feature in this case as it means you can't easily break it.