The best tutorial on CoreData in XCode5

https://www.youtube.com/watch?v=mEAav7dM4hk

Docs:

https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CoreData/cdProgrammingGuide.html#//apple_ref/doc/uid/TP30001200-SW1

https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CoreData/Articles/cdUsingMOM.html

https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CoreData/Articles/cdCreateMOs.html