All 7 State Management with Provider questions
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What is ChangeNotifier, and how does calling notifyListeners let your interface automatically rebuild itself the moment a given piece of shared state actually genuinely changes? What is the difference between context.watch, context.read, and context.select, and how does correctly choosing the genuinely appropriate one help meaningfully avoid unnecessary, wasteful widget rebuilds? How does MultiProvider let you properly and cleanly combine several genuinely separate individual providers together, avoiding a genuinely awkward, deeply nested pyramid of several separate individually nested Provider widgets? How does ProxyProvider let you properly create a given provider whose own value genuinely depends on the current value of a completely separate other already existing provider? How do you properly test a widget that genuinely depends on Provider, using a properly mocked or fake provided value to reliably verify that widget's own behavior in complete isolation?
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How should you properly structure a genuinely large app's own overall Provider architecture, deciding exactly where within the widget tree each individual specific provider should genuinely be scoped and properly placed?

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Answer

A genuinely well structured large Provider based app typically places providers representing genuinely truly global, app wide state, such as authentication status or the current active theme, at the very top level near your app's own root MaterialApp widget, while properly scoping a considerably more narrowly focused, feature specific provider, such as one specifically managing a single particular form's own state, considerably lower down within the tree closer to precisely where it is actually genuinely needed, avoiding unnecessarily exposing that particular narrowly scoped state to genuinely unrelated other parts of the app that simply do not actually need it at all, and this careful, deliberate scoping consideration meaningfully helps both overall performance and general code organization.
// Global providers near the app root
// Feature specific providers scoped closer to where they are genuinely actually needed
Real-world example A large e commerce app places its own genuinely global authentication and theme providers near the app's own root widget, while properly scoping its own considerably more narrowly focused checkout flow provider only around that particular checkout feature's own specific screens, avoiding unnecessarily exposing that specific checkout state anywhere else throughout the rest of the app.

Common follow-ups: How do you actually properly decide whether a given specific piece of state genuinely deserves being scoped globally versus considerably more narrowly locally instead?;What genuinely happens to a narrowly scoped provider's own current state once a user actually navigates away from that particular specific screen?

Flutter App Architecture with Modular Feature Folders;Flutter Performance Optimization
All 7 State Management with Provider questions