At the core of Excel Add-ins, for Office 365 and Office Desktop, is a thorough knowledge of the Excel Object Model. In this course, Build Excel Add-ins with Office JS APIs, you'll learn how to build your own Excel Add-in. First, you'll learn about asynchronous programming with the Excel Object Model. Next, you'll discover User Experience Design with the Office Fabric UI. Finally, you'll explore the specifics of building tables and charts. When you’re finished with this course, you'll have a foundational knowledge of Excel Add-ins that will help you as you move forward to building add-ins for your organization and the Microsoft Office Store.