On day 11 of the 12 Days of Retool, the focus is on using Retool components to create a custom video player for showcasing highlights of the top 11 FIFA World Cup games from 2022. The process involves leveraging the Table Component for navigation, the Video Component for video playback, and integrating with custom REST APIs and YouTube’s API to fetch game data and video descriptions. By utilizing JavaScript and querying techniques, users can interact with a table to select games and view corresponding highlights, with additional metadata displayed in a sidebar. This exercise demonstrates Retool's capability to create interactive applications, encouraging users to explore new functionalities for their own projects.