What is React.js?
you develop your applications by creating reusable components that you can think of as independent Lego blocks. These components are individual pieces of a final interface, which, when assembled, form the application’s entire user interface.
How to Use React.js
In contrast to other frameworks like Angular, React doesn’t enforce strict rules for code conventions or file organization. This means developers and teams are free to set conventions that suit them best and implement however they see fit. With you can use as much or as little as you need due to its flexibility.
you can create a single button, a few pieces of an interface, or your entire app’s user interface.