Syntax

                  GridView(
                    gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: 3,
                    ),
                    primary: false,
                    padding: const EdgeInsets.all(20),
                    children: <Widget>[
                      // widgets
                    ]
                  )

                  

                

               

                import 'dart:ui';
 
import 'package:flutter/material.dart';
 
void main() => runApp(const MyApp());
 
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
 
  static const String _title = 'Flutter Tutorial';
 
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}
 
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);
 
  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
 
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: GridView(
        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 3,
        ),
        primary: false,
        padding: const EdgeInsets.all(20),
        children: <Widget>[
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 1"),
            color: Colors.orange[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 2"),
            color: Colors.green[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 3"),
            color: Colors.red[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 4"),
            color: Colors.purple[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 5"),
            color: Colors.blueGrey[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("Tile 6"),
            color: Colors.yellow[200],
          ),
        ],
      )
    );
  }
}