In this video, we dive deeper into working with route handlers by learning how to handle GET requests in Next.js. We will use Thunder Client, a REST API client for VS Code, to test our route handlers without setting up a database. Our data will be stored in memory and cleared upon app restart or page refresh. We'll create a basic GET handler to return an array of comments as a JSON response and test it using Thunder Client. This tutorial focuses on understanding the mechanics of GET route handlers.