The usual roadblock in this process is getting ports exposed to the internet. In the best case this can just be done on your router configuration. In the unfortunately common case the ISP blocks you from doing this and the only solution is to change ISP.
The only thing you have to google for is “Port Forwarding” and it’s usually a few clicks in your router interface. Then you just run the service you want on your computer / NAS / Raspberry Pi and tell your router to forward the port to your service IP / Port. If you have a dynamic IP at home you probably also do have to get a script or something to update your domain records if you want to point a domain to your home service.
