Flutter Tutorial | Flutter Flex and Expanded Widgets | Flex and Expanded widget in Flutter |

Flutter – Flexible Widget
Flexible is a built-in widget in flutter which controls how a child of base flex widgets that are Row, Column, and Flex will fill the space available to it. The Expanded widget in flutter is shorthand of Flexible with the default fit of FlexFit.tight. Flexible widget plays a very important part in making a responsive app that looks and feels the same across multiple device sizes. But if one wants just basic filling up of spaces by widgets, then Expanded is also a good candidate for that.

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Flex Widget
A widget that displays its children in a one-dimensional array.
The Flex widget allows you to control the axis along which the children are placed (horizontal or vertical). This is referred to as the main axis. If you know the main axis in advance, then consider using a Row (if it's horizontal) or Column (if it's vertical) instead, because that will be less verbose.
To cause a child to expand to fill the available space in the direction of this widget's main axis, wrap the child in an Expanded widget.
The Flex widget does not scroll (and in general it is considered an error to have more children in a Flex than will fit in the available room). If you have some widgets and want them to be able to scroll if there is insufficient room, consider using a ListView.
If you only have one child, then rather than using Flex, Row, or Column, consider using Align or Center to position the child.

Flutter – Expanded Widget
Expanded widget in flutter comes in handy when we want a child widget or children widgets to take all the available space along the main-axis (for Row the main axis is horizontal & vertical for Column). Expanded widget can be taken as the child of Row, Column, and Flex. And in case if we don’t want to give equal spaces to our children widgets we can distribute the available space as our will using flex factor. Expanded widget is similar to the Flexible widget in flutter, with its fit property set to FlexFit.tight as default. Expanded widget is basically a shorthand of Flexible widget. But if you are planning to build responsive apps or web apps, then you should definitely switch to Flexible to get more fit options.

Expanded Widget
A widget that expands a child of a Row, Column, or Flex so that the child fills the available space.
Using an Expanded widget makes a child of a Row, Column, or Flex expand to fill the available space along the main axis (e.g., horizontally for a Row or vertically for a Column). If multiple children are expanded, the available space is divided among them according to the flex factor.
An Expanded widget must be a descendant of a Row, Column, or Flex, and the path from the Expanded widget to its enclosing Row, Column, or Flex must contain only StatelessWidgets or StatefulWidgets (not other kinds of widgets, like RenderObjectWidgets).


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