Flutter is an open-source UI SDK developed by Google that has gained popularity among developers due to its rapid iteration, expressive UI, and native performance on both iOS and Android. To get started with Flutter, it's recommended to check out quick start guides for various platforms such as Android, iOS, Web, React Native, and Xamarin.Forms, as well as Google's Codelabs tutorials that cover topics like basic layout concepts, writing the first app, building beautiful UIs, and learning the Dart language. The official Dart guides are also a great resource to get accustomed to using Flutter. For a more visual approach, there are numerous video resources available, including the Flutter in Focus series, The Boring Flutter Development Show, and the Flutter team's YouTube channel. Additionally, Instabug offers a comprehensive platform for testing new features, improving app performance, and gathering user feedback across the entire app lifecycle.