Good resources for learning Objective-C [closed]

Answer 1

• Concepts in Objective-C Programming and Cocoa Core Compentencies - Apple's official basic documentation for the language and the Cocoa framework.
• Cocoa Programming for Mac OS X - The definitive book for Cocoa newcomers. It's actually focused on the Cocoa frameworks more than Objective-C, but still invaluable.
• Programming in Objective-C 2.0 - Focuses on Objective-C itself more than Cocoa; may have more basic information than an experienced programmer would need, but covers plenty of good stuff.
• The "Language" part of Matt Neuberg's Programming iOS 6 covers Objective-C itself in detail.
• CocoaDevCentral - Excellent tutorials. Start with the "Learn ..." and "Objective-C Style" tutorials.
• Stanford's free CS193E and CS193P courses
• CocoaHeads.org - A large list of resources (books, website, and code) about Cocoa/Objective-C.
• HyperJeff's Cocoa Literature List - A huge compendium of useful information, etc.
• Cocoa With Love - An excellent blog with specific, useful snippets and in-depth explanation.
• Cocoa Is My Girlfriend - A fun and useful blog (usually) about Cocoa.
• Best Practices for Cocoa Programmers (by Aaron Hillegass) - A bit dated, but contains some nuggets and guidelines for understanding and following Objective-C/Cocoa conventions
• CocoaDev.com wiki - Especially good for specific questions about a specific class or task. (Undergoing updates.)