This post introduces how to build a custom React video chat application using Daily's real-time video and audio APIs and the new custom React hooks library, Daily React Hooks. The goal is to create a fully custom experience by leveraging daily-js and Daily React Hooks. The app will include basic features such as creating and joining calls, adding participants, muting devices, screen sharing, and error handling for device permissions. The application uses React's useState hook for managing state and React's useEffect hook for side effects. It also utilizes the useDaily hook to access the call object and other hooks from Daily React Hooks library to simplify code and abstract away complexity. The app is structured into two main views: a home screen with a "Start Call" button and a call UI that displays video and audio streams of participants, as well as controls for muting devices and screen sharing.