• freeCodeCamp.org / How to Use Streams and Services for Flutter State about app-wide state, working with streams, services

Books

• Taking Flutter to the Web. Learn how to build cross-platform UIs for web and mobile platforms using Flutter for Web by Damodar Lohani - 206 pages
• Managing State in Flutter Pragmatically. Discover how to adopt the best state management approach for scaling your Flutter app by Waleed Arshad - 246 pages
• Cross-Platform UIs with Flutter. Unlock the ability to create native multiplatform UIs using a single code base with Flutter 3 by Ryan Edge Alberto Miola - 260 pages
• Flutter and Dart Cookbook by Rich Rose - 200 pages