You shouldn't need it right now - but in case you ever want to dive in, here's the official React documentation: https://reactjs.org/
Had issues with the Codepen demo? Here's the finished source code: https://codepen.io/anon/pen/MELQaQ
Dive in and learn React.js from scratch! Learn Reactjs, Hooks, Redux, React Routing, Animations, Next.js and way more!
Access to this course only.