Let’s build a non-trivial app with React and then refactor it to use Redux!
Much of the advice you get regarding the addition of Redux to your React projects is to only do so once they reach a certain size, because of the extra complexity Redux adds. That’s certainly fair. But it will leave you with a bit of technical debt (refactoring to be done later) that you wouldn’t have if you just started out with React and Redux.
Consequently, I thought it might be nice to present an exercise where we do just that: build an app as simply as possible using React and ReactDOM alone (not even JSX since you need more dependencies and a build process to support that), and then refactor to use JSX and Redux.