You can either follow these steps to build your chat app,
Define your requirements: Create a checklist of the requirements that you need in your chat app.
Design User Interface: It’s all about how you present it. Design a simple and aesthetic UI with a proper user experience.
Develop the frontend: Implement your pre-designed UI and UX in the development part now.
Build the backend: The backend of your app will handle user authentication, storage, and other key functionalities.
Test and Deploy: Test your app for smooth performance and debug any issues that arise during testing.