This tutorial teaches developers how to create a habit tracker using Twilio Functions and Notion. It covers creating a local project with the Twilio CLI and Serverless Toolkit, setting up a Notion integration and database, and implementing an SMS webhook function that interacts with the Notion database to mark habits as complete or add new habits. The project also includes a daily summary feature that retrieves the current day's habits from the database. The tutorial provides step-by-step instructions and code examples to help developers build a habit tracker that can be used to track personal goals and improve productivity.