Can anyone please explain in simple terms, what is a State and what is State Management? (I'm using Flutter but I'm open to both general and Flutter/Dart specific answers)
I'm just trying to learn the core idea behind the concept.
In its most general form, state is the everything that would need to be restored to return to a particular point in time. The scope also has to be defined, since it's not reasonable to move planets backwards in their orbits, so you'll generally have an app state, or a widget state, or possibly separate states within an app (a game board that changes while the high score section doesn't until the game ends with a new high score).
The Flutter documentation is a pretty good description on what it is, why, and how to do it:
https://docs.flutter.dev/data-and-backend/state-mgmt/intro
https://docs.flutter.dev/data-and-backend/state-mgmt/simple
Often changes to the state are stored in a buffer allowing you to undo them or redo them in sequence, or they can be saved as a checkpoint to restart after a crash or forced quit/suspend (depends on the app environment).