Build a real-time chat application in React Native based on WhatsApp's UI design, focusing on backend development using AWS Amplify. Learn to implement GraphQL subscriptions for real-time chat functionality, update chat rooms with new messages, and handle keyboard interactions. Explore topics such as implementing last messages in chats, creating subscriptions for new messages, and improving user experience. Gain hands-on experience with React Native, modern JavaScript, TypeScript, and AWS Amplify while following best practices and using the latest technologies in mobile app development.