Edit:
Does your monitor have a USB hub?
Could use that and then swap the USB Hub cable between PCs, connect your Personal PC via Display Port and your home PC via HDMI, then switch using the monitor's menu button?
Now playing Halls of Torment, have played and finished Vampire Hunters, HOT is a bit different, I miss the swinging music of VH. that said it's fun to figure out and explore HOT.
purchase something like a small Synology NAS and learn how to set up the networking/firewall bits
buy/repurpose a used desktop/laptop, install something like yunohost/unraid
buy parts for your own server, put it together, use the same own server but install proxmox, setup VMs/containers
use the same own server but install debian, play around with docker/docker-compose/ansible
If you don't have the means to get new hardware, you can use hyper-v or virtualbox for free on Windows or virtualbox/virt-manager on Linux on existing hardware.
Simple project to start with: install pihole and configure it as your DNS adblocking filter at home
install iphole on a VM/PC/raspberry pi that is connected to your home LAN
configure your PC or router to use the pihole host as DNS server
test various websites you know that have ads before and after using pihole
While doing things like these, keep notes what you do by day, using those notes, put together your own howto manuals.
Do not be afraid to fail, sleep over it and try again, don't be afraid to ask specific questions here or on other forums, IRC.
Now for the Final Challenge, write an eli5 tutorial on how to host and maintain a mail server!