Unable to set HTTPS using LetsEncrypt in Nginx server

I followed the following tutorial to set https for my website: https://www.digitalocean.com/community/tutorials/how-to-deploy-a-laravel-application-with-nginx-on-ubuntu-16-04

But, I got stuck at this place - Step 6 — Securing your Application with TLS

There are no ssl-*.conf in my snippets folder to match the lines in the above conf file for TLS. I did not see any other errors up to this point. I can view my site with Http, but not HTTPS. Please advise.

include snippets/ssl-example.com.conf;
include snippets/ssl-params.conf;

The following command:

$ sudo nginx -t

yields:

nginx: [emerg] open() "/etc/nginx/snippets/ssl-example.com.conf" failed (2: No such file or directory) in /etc/nginx/sites-enabled/example.com:13

Yes, those files aren’t there. So, I guess the tutorial skipped the step that generated those files.

The following command:

$ ls /etc/nginx/snippets

yields:

fastcgi-php.conf
snakeoil.conf

Clearly the ssl-*.conf files are missing.

Please help.

Thanks in advance.