how to change font in flutter code example

Example 1: flutter font bold

Text(
  'Some text',
  style: TextStyle(
    fontSize: 24,
    fontWeight: FontWeight.bold),
)

Example 2: add font in flutter

MaterialApp(
  title: 'Fonts',
  theme: ThemeData(fontFamily: 'Mukta'),
  home: HomePage(),
);
 
 In pubspec.yaml
 fonts:
    - family: Mukta
      fonts:
        - asset: assets/fonts/Mukta/Mukta-Regular.ttf
          weight: 400

Example 3: flutter set default font family for whole app

MaterialApp(
  title: 'Custom Fonts',
  // Set Raleway as the default app font.
  theme: ThemeData(fontFamily: 'Raleway'),
  home: MyHomePage(),
);