First We should know about the react some are the basic steps are there,What is react ? How it's working ?What is the process ?
Working with APIs Again, don't just learn, APPLY.
This are the topic to learn the JSX It's will be help you
Working with third-party APIs.
React router is a routing library for react which will help you to navigate through different pages in your React App.
Learn about loading specific page's content, passing params in the URL, redirecting etc.also know the react router is not the part of the react,it's the react library.
That's are the topic to learn and help you to learn the Advance React.You can also learn some extra libraries like Material UI, reactstrap, tailwindcss, Semantic UI etc, once you have learned the basics of React.also try to make project in you day to day life.