Objective-C
Official site: https://developer.apple.com/
You may want to learn Swift as your first/next language.
Courses
Treehouse β Objective-C Basics
Code School β Try Objective-C (Free)
For iOS app development:
Treehouse β Build a Simple iPhone App With Objective-C
Code School- iOS
Tutorials (Free)
Tutorials Point β Objective-C Tutorial
Books
Objective-C Programming: The Big Nerd Ranch Guide
iOS Programming: The Big Nerd Ranch Guide
Programming in Objective-C
Cocoa Programming for Mac OS X
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