Install Flutter
Ready to build beautiful, multiplatform apps from a single codebase? Choose from the following two options to get started setting up your Flutter development environment.

Flutter documentation
Get started with Flutter. Widgets, examples, updates, and API docs to help you write your first Flutter app.

GitHub - flutter/flutter: Flutter makes it easy and fast to ...
Flutter is Google's SDK for crafting beautiful, fast user experiences for mobile, web, and desktop from a single codebase. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.

Flutter (software) - Wikipedia
Flutter is an open-source UI software development kit created by Google. It can be used to develop cross platform applications from a single codebase for the web, [4] Fuchsia, Android, iOS, Linux, macOS, and Windows. [5]

Development - Flutter
Flutter allows you to build apps for mobile, web, desktop, and embedded devices — all from a single codebase.

Flutter Tutorial - GeeksforGeeks
This Flutter Tutorial is specifically designed for beginners and experienced professionals. It covers both the basics and advanced concepts of the Flutter framework.