Layout Widgets: Row, Column, Center

Common Built-in Widgets in Flutter

Stateless vs Stateful Widgets

Nesting Widgets to Build a UI

Parent and Child Widget Relationships

Mounting the Root Widget

Defining a Custom Widget

Positional vs Named Constructor Args

Container color vs decoration

Nesting Widgets in the Tree

Scaffold appBar Type

Updating UI with setState

child vs children

Center Takes a Single Child

setState in the Wrong Widget

Using BuildContext Correctly

StatefulWidget Needs createState

const Constructor for Widgets

StatelessWidget build Signature

The Widget Tree Structure

Everything Is a Widget

What a Widget Is in Flutter

Widgets Are Immutable UI Descriptions

Widget Properties and Constructor Arguments

Root Widget and runApp Entry Point

Widget Immutability

Widget Composition

Common Built-in Widgets

Root Widget of the App

Parent and Child Widgets

child vs children

Widgets Return Widgets

Constructors and Properties

Layout vs Content Widgets

Passing Data via Constructors

Widget Rebuilding on Change

Parent and Child Widgets

The child and children Properties

Root Widget of the Tree

Single-Child vs Multi-Child

Widgets Are Immutable

The Build Method