Flutter
The folders you will find in the project
- android: it's an Android Studio project that is used to test and compile for Android
- ios: it's an Xcode proect that is used to test ad compile for iOS and iPadOS (macOS-only)
- web: it's the output folder for the web files to test and package for web and PWAs
- windows: it's the generator code for creating Windows executable packages
- test: unit testing for your project
- build: intermediary files
- lib: ACTUALLY, YOUR SOURCE CODE
The pubspec.yaml is the configuration file for the project.
You can create other folders and files in the structure, such as an assets/ or images/ folder, but to include its content in the packages you have to define them in the assets: section in the pubspec.yaml.