wtf is gsy_flutter_book?

This repository is a long-running series of Chinese-language articles and tutorials about building apps with Flutter, a toolkit from Google for creating mobile, web, and desktop applications from a single codebase. The author, a developer who goes by CarGuo, has been publishing and updating this series over several years, covering Flutter from beginner basics all the way to advanced internals. The series is organized into chapters that follow a natural learning progression. Early chapters cover the Dart programming language and the fundamental building blocks of a Flutter app. Later chapters go deeper into topics like layout systems, state management, rendering behavior, scrolling physics, image loading, and mixing Flutter code with native Android or iOS code. There is also a dedicated section tracking every major Flutter and Dart release, with summaries of what changed in each version going back to Flutter 1.12. Alongside the article series, the author maintains a companion GitHub app project called GSYGithubAppFlutter, which is a fully functional open-source app built with Flutter that readers can study alongside the written material. There is also a separate demo project with many standalone examples. A published print book based on this series is available for purchase on Chinese retail platforms. The README is primarily in Chinese and links to an online reading site, a PDF download, and the author's social profiles on platforms like Juejin, Zhihu, CSDN, and Jianshu. The material is aimed at Chinese-speaking developers who want a structured, detailed reference for learning Flutter, tracking SDK changes, or understanding how the framework works under the hood.