Either ignore like I do or add a self signed cert to trusted root and use that for your services. Will work fine unless you’re letting external folks access your self hosted stuff.

If you’re running mostly Linux vms proxmix us really good. It’s based on kvm and has a really nice feature set.

I find mine useful as both a learning process and as a thing need. I don’t like using cloud services where possible so I can set things up to replace having to rely on those such as next loud for storage, plex and some *arr servers for media etc. And I think once you put the hardware and power costs vs what I’d pay for all the subs (particularly cloud storage costs) it comes out cheaper at least with hardware I’m using.