First things first, the setup is currently up and running. but i would like to modify it to use a reverse proxy through my personal domain.

Currently, i'm using an old pc with Truenas and a jail with jellyfin in it. i'm connecting to it with the free Fritz!Box VPN service.

but that's stupid and slow. so i've bought a domain at godaddy.com. but i don't understand the principle of whatever is managing the domain knowing the public IP-adress of my server. i've heard of Caddy, but it's also running locally, so i don't understand how i connect the pc to the domain.

if anyone could simplify this down for me, it'd be very helpful.