Starting on Xcode

I have found an Intro to xcode that is more of a reference site than an intro. This site linked me to:

• an image of shortcuts on xcode
• a pdf on how to become a xcoder
• a link to apples dev site which has an intro to cocoa

This is the beginning of my research. 

I have already registered as a dev on apple and downloaded the necessary programs and sdk for iOS and Mac