Eric Windmill is a professional Dart developer, a contributor to open-source Flutter projects, and the author of FlutterByExample.com. His work is featured on Flutter's own showcase page.

Flutter in Action • Eric Windmill

https://manning.com/books/flutter-in-action

Flutter by Example • Eric Windmill

https://flutterbyexample.com

How Flutter renders Widgets • Matt Sullivan & Andrew Fitz Gibbon

https://youtube.com/watch?v=996ZgFRENMs

When to Use Keys - Flutter Widgets 101 • Emily Fortuna

https://youtube.com/watch?v=kn0EOS-ZiIc

Flutter Samples • Brian Egan

http://fluttersamples.com

Dart by Example • John Ryan

http://jpryan.me/dartbyexample

The Rust Programming Language

https://doc.rust-lang.org/1.26.0/book/second-edition

Learn to Program • Chris Pine

https://pine.fm/LearnToProgram

Reddit comment regarding Flutter Web • Ian Hickson

https://reddit.com/r/FlutterDev/comments/dx3h9e

Discussion: https://www.reddit.com/r/FlutterDev/comments/e4d984/eric_windmill_its_all_widgets_flutter_podcast/