Learners will discover how to build React applications working in the development and the production environments, in this 12-video course. Examine how to add state to an application and add and delete comments; explore React Develop Tools and their use, along with several other topics. Begin by setting up a simple application in the create-react-app environment, which will download and install several NodeJS packages using npm, and then move on to adding state within the application. Learn how to wire up event handlers to add new comments, and also wire up event handlers to delete comments. Discover how to install and work with React Developer Tools, and use these tools to explore the component tree. Also learn how to use React Developer Tools to profile applications. Next, examine how to create a production build with minified files and static assets; explore the different files generated in a production build, and how to serve the application in a production build.