This tutorial guides users in building an SMS appointment reminder app using CakePHP and Twilio. To start, prerequisites such as basic PHP knowledge, a MySQL database, Composer, and a Twilio account are required. The project involves creating a form for entering appointment details, which are then stored in the database. A table displays the appointments with buttons indicating how close each appointment is to its scheduled date. When an appointment's button is clicked, a reminder SMS is sent using Twilio's API. Throughout the tutorial, users learn about setting up the database, creating models and controllers, and configuring routes for the application. The final step involves testing the app, which can be accessed by navigating to http://localhost:8765/appointments/add. Upon completion, users have built a functional SMS appointment reminder app using CakePHP and Twilio.