Column(
  children: [
    Text("บนสุด"),
    Text("กลาง"),
    Text("ล่างสุด"),
  ],
)

Row(
  children: [
    Icon(Icons.star),
    Text("รายการ 1"),
    Text("รายการ 2"),
  ],
)

Stack(
  children: [
    Container(width: 100, height: 100, color: Colors.red),
    Positioned(
      top: 10,
      left: 10,
      child: Text("ซ้อนบน"),
    ),
  ],
)

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("Layout เบื้องต้น")),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              children: [
                Icon(Icons.home),
                Icon(Icons.star),
                Icon(Icons.settings),
              ],
            ),
            SizedBox(height: 20),
            Stack(
              alignment: Alignment.center,
              children: [
                Container(width: 120, height: 120, color: Colors.orange),
                Text("กลางภาพ", style: TextStyle(color: Colors.white)),
              ],
            ),
          ],
        ),
      ),
    );
  }
}