Instead of nginx, you can try Caddy, which is way easier to get started with and rolls HTTPS for you - no actions needed. Nginx is very powerful, but also very “programmer-brained” and at times really confusing. Strictly speaking with Caddy all you’ll need is installing it, opening ports, editing its config to point at a local IP or directory, and you’re done.

caddyserver.com Read the docs there as well, they are good and understandable. Follow the Caddyfile steps, not JSON.