This video demonstrates how to use Alter, an AI assistant, to extract information and master content from YouTube videos. It showcases two main use cases: finding restaurant information in Paris from a travel video and following step-by-step tutorials more efficiently. Alter automatically transcribes videos, allowing users to interact with the content directly, ask specific questions, and receive organized information, such as restaurant addresses and order of appearance, exportable for use in tools like Google Maps. It also assists in executing tutorials by providing instructions step-by-step.