No doubt, there is an endless amount to learn with Linux. I’ve been using it for servers since the early '00s, and have been using it as my main OS on my personal devices since probably 2016, and I still regularly learn new things. If you are trying server stuff out on PC hardware, I suggest looking into virtualization. Proxmox is a great OS to start with for a virtual host. Then you can try out as many OSs as you want as virtual machines. You may be way ahead of me on that, but back when I was first learning what it meant to run a server it was of great help to me. That was before the days of docker and most containers(although I did use BSD Jails a little).