Sadly, the answer can range from super technical to super boiled down version. Depending on individual’s knowledge, money reserves, and the will to set things up the proper way.

Here’s the boiled down version: You will need a server with a public IP address, preferably a hostname. The server has have SSH access. Then it is whichever way is most convenient - direct install, docker, etc.

I, for example, have a Scaleway + Cloudflare DNS for my server and run everything in Docker behind Traefik reverse proxy that automatically serves certificates.

The price is about 15€ for the server per month, DNS is free, domain is under 20€ a year - although way cheaper ones exist.