I have just started to learn how to build Apps. Here are some great resources and tools to make it happen.
Before you dive into Objective-C, it’s helpful to get a solid understanding of C. Cocoa Dev Central has an awesome walkthrough that will teach you the specific areas of C that are relevant to working with Cocoa. In other words, this tutorial is specifically targeted for people looking to take their first step in learning to program Mac applications.
Apple’s Intro to Objective-C
It’s always a good idea to go straight to the source. Apple has a ton of support for both new and experienced developers and really seeks to make the entire process as easy as possible. This guide will serve as a basic introduction to Objective-C and Cocoa application frameworks. Also be sure to check out Apple’s thorough Getting Started Guides, which cover a range of topics for new developers.
Cocoa Dev Central: Learn Objective-C
Cocoa Dev Central, the same folks who wrote the intro to C above also have a super basic introduction to Objective-C. If you’re already familiar with other programming languages, this might be a good place to start.”