You buy a domain from a domain registrar, like Cloudflare. You provide your public IP address to Cloudflare and when you use your domain name it will direct the request to your public IP.
If you don't want to pay for a domain name, there are free services like duckdns that will give you semi-custom domain names.
Jellyfin 10.9.11
Ubuntu 24.04 LTS (bare metal)
Intel i3 12100 on Asus Prime H610M-E D4 mATX
32GB DDR4-3600
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
WD Green 3TB (Samba shares)
WD Red 3TB CMR (WIP Media, Test libraries)
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)
Fractal Meshify 2
Corsair CX430