In this episode of the GitHub for Beginners series, the focus is on using GitHub Copilot to build a backend REST API for Planventure, a travel itinerary application. The process involves setting up a development environment using Visual Studio Code, Python, and SQLite, and utilizing Copilot's AI capabilities to automate tasks like setting up a Flask API with SQLAlchemy for database management, implementing user authentication through password hashing and JWTs, and enabling full CRUD functionality for trip management. The guide emphasizes the importance of reviewing and understanding AI-generated code, as well as integrating authentication features to secure the API. By the end of the episode, users are equipped with a functioning MVP API, complete with user registration and trip management capabilities, and are encouraged to document their project with a README file created with Copilot. The episode concludes with a teaser for the next part of the series, which will focus on building a frontend to connect to the API.