Suggestions on how or what to create with 5 PC's?

What to create with the 5 Pc’s I currently have? I would like to create a server of some kind, but not quite sure how to get started. They’re all running Windows 11, but I’m thinking of putting a different Distro on each of them. Please help…

If you want to play with TrueNAS go to the Documents and start learning about it and the system requirements and ZFS terminology.