Build a sophisticated Facebook Messenger-style chat application using React JS, Firebase, and Chat Engine. Learn essential web development skills including routing, Firebase social authentication (Google and Facebook login), React Context API, REST APIs, and environment variables. Create a feature-rich chat platform with online statuses, image support, sound notifications, and multiple chat rooms. Follow along as the tutorial guides you through setup, Firebase integration, context management, user API creation, environment variable configuration, and deployment. By the end, you'll have developed a fully functional, modern chat application with enhanced features and design.