In a JavaScript course, participants typically learn the fundamentals of the JavaScript programming language, including variables, data types, control structures, functions, and object-oriented programming concepts. The course may cover DOM manipulation, asynchronous programming with callbacks and promises, and interacting with web APIs. Participants often gain practical experience through coding exercises and projects, enabling them to create dynamic and interactive elements on websites. Advanced topics such as frameworks (e.g., React, Angular, or Vue) and server-side JavaScript (e.g., Node.js) may also be introduced, depending on the course’s scope and level.