This tutorial teaches how to create a mailing list using Twilio's SendGrid Email API with Laravel and a Vue.js frontend, enabling bulk email sending to over 100 recipients at once. The application allows users to enter their email addresses and save them to the database, and then sends out bulk emails to provided email addresses. The process involves setting up a new Laravel project, configuring the database and .env file, creating a controller to handle form validation and sending of emails using SendGrid, and adding a Vue.js frontend to interact with the application.