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This course teaches developers how to use the LiveViewJS library for reactive app development in NodeJS and Deno. By leveraging web sockets, developers can create reactive applications that respond to user events with minimal UI diffs. The course covers handling socket connections, client event handling, HTML and DOM-diffing, and updates. The teaching method involves introducing the LiveView paradigm and reviewing the LiveViewJS library, providing a simple API for implementing LiveViews in web servers like ExpressJS and Oak. The intended audience for this course is NodeJS and Deno developers looking to simplify their web development process and adopt a reactive programming approach.