Creating a responsive web app is a smart way to ensure your application works well on various devices. To begin, start by designing your app with a mobile-first approach. This means crafting your app’s layout and functionalities primarily for mobile devices, then scaling up for larger screens. Next, utilize a responsive framework like Bootstrap or Flexbox to help structure and style your app efficiently across different screen sizes. Remember, responsiveness is key to providing a seamless user experience. Lastly, test your web app thoroughly on various devices to ensure it looks and functions flawlessly across all platforms. With these steps, you’re on your way to building a responsive web app that users will love!