The article provides a comprehensive guide on integrating RxJS, a library for reactive programming, with React applications using React Hooks for state management, specifically in the context of a chat application. It walks through installing necessary software, setting up the application with React Router 6, and creating a chat store using RxJS Subjects and Observables. The guide explains how to manage state by subscribing React Hooks to RxJS Subjects, enabling components to share data and update in response to new messages. It also details the creation of chat components that represent different users and a switcher component for navigating between them. The article highlights the changes from earlier versions of React, React Router, and RxJS, and contrasts RxJS with other state management tools like Redux, presenting RxJS as a straightforward and effective method for managing state in React applications.