Application state is the central and crucial piece for any single-page web application. When your app starts to become confusing, this is generally where things go wrong. Painful and confusing bugs start creeping in and you can't seem to keep them out. In this course, Redux Fundamentals, you'll learn how to transform an existing web app to use Redux. First, you'll explore a React app with state problems and look at whether you should use Redux to fix these state problems. Next, you'll discover how to apply Redux piece by piece and analyze the basic building blocks of Redux in simple terms. Then, you'll delve into migrating your React app to Redux. Finally, you'll learn how to add Redux to any web app. By the end of this course, you'll be able to add Redux to an existing app or a brand new web application with confidence, and be able to exercise good judgment to choose when, how, and if using Redux is the right choice for your team.