I have been taking some training on Objective C. I have finished all the content in the course. I feel the course was excellent. However, I still feel like I do not know how to make a desktop application for OS X. The Cocoa framework was also covered a little in the training. I guess now I need to understand how to apply my knowledge to Xcode for designing GUI for a program? My goal is to mimic apps for Windows Desktop I have been working on (C++ C# Visual Studio etc.). That is; make the same version for OS X. Could someone recommend training material for learning how to build modern desktop apps for OS X. Building OS X apps for desktop does not seem to be a big thing these days (I would love to discus this)?