This tutorial helps build a webinar platform using Daily Prebuilt and a custom chat widget by adding meeting token validation. The goal is to differentiate between hosts (or "admins") and attendees, allowing for more control over user experience in video calls. Meeting tokens can be used to set a participant's username or identify them as validated. To add meeting token validation, the tutorial covers creating meeting tokens using Daily's API, accessing query parameters in React, and validating tokens in the WebinarCall component. The process involves checking if a valid token is provided by participants, validating it with Daily's API, and setting the participant's status accordingly. The tutorial also discusses handling Daily API requests and using Netlify to proxy requests. By following this tutorial, developers can add meeting token validation to their app without building a formal back-end or authentication system.