A Easy Sample Flutter application.
I have gone through the following links to build this sample application. Please use this reference for better understanding
Flutter Widgets is used to understand the Flutter's widgets.
Layout Widgets is used to understand the Flutter's layouts.
Flutter UI inspector is used to analyse the designed screen.
Debugging Flutter Apps is used to understand debugging process.
Building Layouts in Flutter - building a simple UI and inspect it
For help getting started with Flutter, view our online documentation.