what is flutter?
Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, desktop, and embedded devices from a single codebase.
Scaffold:
Implements the basic material design visual layout structure.
App bar:
An app bar consists of a toolbar and potentially other widgets
Create your Own flutter app:
#1
https://youtu.be/Y2fj7w_4gI8
#2
https://youtu.be/XN-M0gijq70
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Source
flutter widgets tutorial-Appbar