Answers for "flutter material navigation"

flutter navigate to new screen

// Within the `FirstRoute` widget
onPressed: () {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => SecondRoute()),
  );
}

flutter navigation

// inside MaterialApp in main.dart
routes: {
        '<route_name>': (context) => MySecondscreen(),
      },
      
// where you want to execute the code
Navigator.pushNamed(context, '<route_name>');