Certbot is an ACME client which enables HTTPS on your website deploying Let's Encrypt certificates. Let’s Encrypt is a free, automated, and openCertificate Authority. In this post, you can learn how to set it up for nginx on Amazon Linux.
Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you. Now you can install your favorite CMS concrete5 so easily with composer. Please, follow the following steps to install it via composer.