Beginner

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Core foundations that show up in almost every Flutter screen —widgets, context, and navigation.

Done	Problem	Resources	Note	Revision	Difficulty
	What is the difference between var, final, and const?				Easy
	Explain null safety in Dart				Medium
	What are the differences between List, Set, and Map?				Easy
	What is the difference between async/await and Future?				Medium
	Explain Dart's Stream and when to use it				Medium
	What is the difference between extends, implements, and with?				Medium
	How does Dart handle memory management?				Medium
	What is the difference between == and identical()?				Medium
	Explain generics in Dart				Medium
	What are extension methods and when would you use them?				Medium
	What is a factory constructor?				Medium
	Explain named constructors in Dart				Easy
	What are sealed classes in Dart?				Medium
	Explain Dart records				Medium
	What is cascade notation (..)?				Easy
	What is the difference between StatelessWidget and StatefulWidget?				Easy
	Explain the Flutter widget lifecycle				Medium
	What is BuildContext?				Medium
	How does the Flutter rendering pipeline work?				Hard
	What is the difference between hot reload and hot restart?				Easy
	What are Keys in Flutter and when should you use them?				Medium
	Explain the difference between mainAxisAlignment and crossAxisAlignment				Easy
	What is the difference between Expanded and Flexible?				Medium
	Explain the Scaffold widget				Easy
	How do you handle navigation in Flutter?				Medium
	Explain the difference between Container and SizedBox				Easy
	What is SafeArea and when should you use it?				Easy
	How do you create responsive layouts in Flutter?				Medium
	Explain ListView vs ListView.builder				Medium
	What is CustomPainter and when would you use it?				Medium
	How do you handle form validation?				Medium
	What is the difference between Visibility and Opacity?				Medium
	When should you use setState()?				Easy
	What is InheritedWidget?				Medium
	Explain the concept of "lifting state up"				Medium
	What is Provider and why is it useful?				Medium
	What is the difference between Provider, Riverpod, and BLoC?				Medium
	Widget Inspector: constraints, padding, and overflow debugging				Medium
	Network Inspector: inspect requests, headers, body, and timings				Medium