1 LEMP Droplet, 1 Let's Encrypt Certificate, NGINX SSL 443 Config. How?

Hello Experts.

After setting up a LEMP droplet from the marketplace, I noticed there are NGINX config files in the following locations:

/etc/nginx/nginx.conf /etc/nginx/sites-enabled/digitalocean <- (no extension…) /etc/nginx/sites-available/default <- (no extension…) /etc/nginx/sites-available/digitalocean <- (no extension…)

The goal

1 LEMP Droplet, 1 Let’s Encrypt SSL Certificate.

Question

Which nginx config file do I edit and if I will only be hosting 1 single website per droplet, how do I generate a certificate for mysite.com, www.mysite.com for this scenario and what should my nginx config file look like?

I think generating it is simple but which of the 4 nginx files is it editing?

Run this command to get a certificate and have Certbot edit your Nginx configuration automatically to serve it, turning on HTTPS access in a single step.

sudo certbot --nginx

I am aware of your sweet load balancer easy to setup ssl options but I cannot afford it right now. This would also be a great opportunity to learn from the community by example and how to do it on my own.

Thank you for any help.