The Main Apple Doc
Apple has a lot of great documentation: from the very basic guides and tutorials down to particular API references. But for a very long time newcomers were wondering: where should I start?
Now you know the answer:
For iOS: Start Developing iOS Apps Today
For OS X: Your First Mac App
iOS guide is even better: it shows you all necessary areas from the beginning to the end giving relevant links at each step. Just start with first page and move on.
