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What is the purpose of managed object context NSManagedObjectContext in Objective-C and how does it work?

What mechanisms does iOS provide to support multi-threading?

What is Key-Value-Coding and Key-Value-Observing in Objective-C?

When to use NSArray vs NSSet ?

What's the difference between the atomic and nonatomic attributes?

What is difference between these three classes [NSManagedObject, NSManagedObjectContext,
NSManagedObjectModel] of CoreData?

When would you use Categories over Inheritance and vice versa?

What is the difference between inheritance and Categories in Objective-C?

What is the difference between NSDictionary and NSMutableDictionary ?

What are some limitations and problems you can face with categories?

A grandparent, parent and child problem