About Flutter
This is an excellent framework for developing cross-platform native mobile applications in 2020. Like Golang, TensorFlow, and Angular, Flutter is also from Google, which uses Dart (another programming language from Google) and provides SDK for developing a cross-platform native mobile application.
Flutter solves that problem to release app to different platforms
It's always been challenging to release your app to different platforms like Android, iOS, and Windows Mobile, as you need to maintain separate codebase. Flutter solves that problem by allowing you to create mobile apps for both iOS and Android devices using the same codebase.
Flutter has seen a lot of growth in the last 2 years, and its now the #1 framework for developing native mobile apps. If you have already decided to learn Flutter and looking for a resource, then I suggest you check out this Learn Flutter and Dart MasterClass.