Beginning OS X development: How to?

Hello community,
I´d really like to start developping for OS X and I was wondering if you´ve got soe tips for me.
Sincerely,
Panagiotis B.

Use iTunes/iTunes U - search for iBooks from Apple on Objective-C and Cocoa...should be at least three there you can utilitze - free.
Also see the Xcode 4 User Guide, built-in Xcode Help/Documentation and Mac Dev Center.

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