What are the main lifecycle methods of AppDelegate and how to use them?

The main lifecycle methods of AppDelegate in iOS are related to the application's states:

• application(_:didFinishLaunchingWithOptions:) — called when the app launches, usually used to set up the initial state.
• applicationDidBecomeActive(_:) — the app has become active, tasks can be resumed.
• applicationWillResignActive(_:) — the app is about to move to an inactive state, for example, during an incoming call.
• applicationDidEnterBackground(_:) — the app has moved to the background, data can be saved here.
• applicationWillEnterForeground(_:) — the app is returning from the background.
• applicationWillTerminate(_:) — the app is about to terminate, cleanup can be performed.

Using these methods allows managing resources and the app's state depending on its lifecycle.