In flutter, the initState method is called once when the State object is created and inserted into the tree. It is used for initializing the state of the widget. However, there are certain limitations and rules you need to follow when working with initState.

Why can’t call context in initState ?
1. Context is not fully available in initState : The BuildContext provided to the State object is not fully initialized when initState is called. The widget is not fully mounted in the widget tree, so the context is not ready to be used for certain operations, such as navigating to another screen or accessing inherited widgets.

2. Risk of accessing incomplete or invalid context: If you try to use the context in initState, you might end up accessing an incomplete or invalid context, which can lead to runtime errors or unexpected behavior.

3. Flutter’s design philosophy: Flutter is designed to ensure that the widget tree is fully built and mounted before you start interacting with it. This ensures that all dependencies and inherited widgets are properly setup and available for use.

When to use didChangeDependencies: If you need to perform actions that depend on the BuildContext (e.g., accessing inherited widgets or starting a navigation), you should use the didChangeDependencies method. This method is called after initState and whenever the dependencies of the state object change.

@override
void didChangeDependencies() {
  super.didChangeDependencies();
  // safe to use context here
  final inheritedWidget = MyInheritedWidget.of(context);
  // Perform actions that depend on the context
}

Avoid using context in initState because the widget is not yet mounted, and the context is not fully available.
It’s safe to initialize dependencies in initState as long as they don’t rely on the BuildContext.
Use didChangeDependencies for actions that depend on the BuildContext.