Hi @lequal,

You are correct, DigitalOcean has articles on how to enable Let’s Encrypt on Nginx with Certbot. I would recommend reading and using them as everything is automatically created in your nginx configuration. Here is an article about that : https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-18-04

If you however want to do this manually, you can follow these steps

*1. Log into the server using SSH.
*

ssh root@YourDropletIp

2. Check the OpenSSL client software.

sudo apt-get mod_ssl openssl

3. Make a directory to store the server key and certificate.

$ sudo mkdir mkdir /etc/nginx/ssl

4. Copy the SSL certificate file and server key.

$ touch server.crt /etc/nginx/ssl
$ touch server.key /etc/nginx/ssl

Once you have created the files, paste the information into them

nano /etc/nginx/ssl/server.crt
nano /etc/nginx/ssl/server.key

5. Edit the ssl.conf

$ sudo nano /etc/nginx/sites-available/default/your_very_own_domain.com

Once open, the file can be edited so that it points to the correct files in the Web server. It will look something like:

server {
listen  80;
listen 443 ssl;

ssl on;
ssl_certificate /etc/ssl/your_domain_name.pem; 
ssl_certificate_key /etc/ssl/your_domain_name.key;

server_name your_very_own_domain.com;
access_log /var/log/nginx/nginx.vhost.access.log;
error_log /var/log/nginx/nginx.vhost.error.log;
location / {
root /home/www/public_html/your_very_own_domain.com/public/;
index index.html;
}
}

6.Restart Nginx

service nginx restart

Regards,
KDSys