This tutorial teaches how to build a Laravel package for sending SMS using Twilio's API. To start, you need to set up a new package with Composer and define its autoloading settings. Next, you create a LaraTwilio class that serves as the public API for your package, which interacts with the Twilio PHP SDK library. You also need to create a service provider that binds the LaraTwilio class into Laravel's service container, ensuring it can be injected via dependency injection. Additionally, you define a facade to provide access to the LaraTwilio class and configure your package for discovery in Composer. By following these steps, you can create a reusable package that simplifies SMS integration with Twilio in your Laravel projects.