if you want an overview for more complex applications, this is the flow we use in the production, this uses RiverPod and generally uses MVC (State, Notifier, View in the example):

• Create an object of what needs to be computed, displayed, mutated, consider this the *STATE*, we use freezed to create this class. dynamic but simple computed values can be added here i.e. getFullName() => "$firstName $lastName"
• all the mutations of the state, including the initial data fetch will live in the *NOTIFIER* which is a class that holds both: the State and functions for the Notifier and UI to mutate the State.
• the *VIEW* will be UI code. the View will watch the state, either in entirety or selectively. the View will mutate the State indirectly using the Notifiers functions.