I have been loving proxmox for years. Ran it my lab at work with semi production workloads and at home.
The big suggestion I have is read up on lxc.
Proxmox uses kvm/qemu and you can do a great deal with this even if you don't uses containers.
The biggest value I can add is use 2 drives if you can. Small one for proxmox itself. And then a larger disk for vms. Separate space for isos and templates is a huge benefit (local nas works here to if you have one.
Once you install poke around and make a mess. It will help you decide how you want it. (I reinstalled right after I set it up the first time because I really made some decisions that did not jive well with how proxmox does its thing.