Many registrars let you buy a domain and set up dynamic DNS for it within their system so you can own a domain and get dyndns on it.
Otherwise you could accomplish it with a VPS but you’d only need the smallest one available because it would just need to run nginx to forward to your home ip (and a small tool to update that IP when it changes). So you could probably get something for less than $5/mo.
I see you got your answer, but I’m adding on for anyone else that comes across this.
For me, I learned the most when I had a disposable and replaceable system. When I was dual booted I was too scared to touch anything in case it removeded everything up. Once I started poking round on a Pi, LiveUSB, etc it was a lot easier to learn because I could always restart.
Id start there with something like Mint or Ubuntu. Then set it up in a way where you can easily replace your OS so you can reset it often and removed around. Then just learn as you go.
A Windows VM running Windows terminal, SSH’d back into the host, obviously.
Honestly I stick with whatever the default is and never had a problem that led me to find anything else.