This tutorial covers setting up a Drupal 9 website using Composer, PHP 7.3 or higher, SQLite 3.26 or higher OR MySQL 5.7.8 or higher, and Vonage API account. It explains how to install the necessary dependencies, including the Vonage Drupal module, which provides an admin interface for adding in credentials, creating the Vonage API client, and registering it with the service system. The tutorial also shows how to configure the module, create a custom module to test the Vonage API, and send an SMS message from Drupal using the Vonage API SDK.