Widgets instead of functions

Do

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Column(
      children: const [
        Widget(),
        Widget(),
        Widget()
      ]
    )
  );
}

Don't

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Column(
      children: [
        WidgetFunction(),
        WidgetFunction(),
        WidgetFunction()
      ]
    )
  );
}

Conclusion: Extracting widgets to a method is considered as a Flutter anti-pattern, because when Flutter rebuilds widget tree, it calls the function all the time, making more processor time for the operations while widgets they will be rendered once and will not update themselves.