You have decided to learn React JS from scratch. A great choice indeed! Now, you can start to build a modern website and app that require high performance and safety.
Many developers and site owners are now embracing web technologies and frameworks built on React. Some of these include the Gatsby site framework and the WordPress blocks in the Gutenberg post editor.
These are just to name a few. What this means is that you cannot escape learning React JS if you want to become a present-day developer.