Let;s Encrypt is a free, automated, and open certificate authority for your website or any other projects. You can grab free TLS/SSL certificate including wildcard certificate to create encrypted HTTPS session for your site visitors. You need to use a simple and easy to use bash client called acme.sh to obtain a free certificate. In this tutorial, I will explain how to use Let’s Encrypt to install a free SSL certificate for Nginx web server along with how to properly deploy Diffie-Hellman on your nginx server to get SSL labs A+ score.