I feel like Cloudflare tunnels have trivialised a fair bit of the setup around this. You no longer have to directly expose your home server to the open internet, nor mess with routing tables and DMZ on your router... Just pop a cloudflare tunnel infront of your http server, and let Cloudflare do the rest.

Of course, the physical side still needs some work. Ideally one needs a battery backup and a small solar panel, so that you can weather the odd power cut. And constant connectivity is trivial (but a cheap cellphone as a backup for when your line drops probably gets you 99% of the way there)