I have heard about letsencrypt.org for a while now, but never took the time to get it setup.

I finally found the time and can say that it was quite easy to do, and I can’t believe I didn’t do it sooner.

The main link I followed is here:
https://certbot.eff.org/#ubuntuxenial-nginx

You can change the web server and operating system settings as needed for your setup.