I would like to add some of the quotes to a new screen called as Favorites

Question

Please be kind and tell me where do I add the line of code and what logic to follow?

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final alreadySaved = _savedQuotes.contains(context);
    return MaterialApp(
        theme: ThemeData(primaryColor: Colors.blue[600]),
        home: Scaffold(
            appBar: AppBar(title: Text('Quotes')),
            body: ListView(
              
              padding: const EdgeInsets.all(8),
              children: <Widget>[
                
                ),
                Container(
                  height: 50,
                  color: Colors.blue[200],
                  child: const Center(
                      child: Text(
                          'You only live once, but if you do it right, once is enough.')),
             
                )
              ],
            )));
  }
}

I am very poor at Dart ,And just starting Here is the Scrrenshot of the app

I want to add like icon on the left for each of the quotes that will toggle the Favorite on and off