Best way to learn Objective-C

I would like to learn Objective-C using online tutorials. I'm a native C# programmer but I know C++. Which compiler should I use on windows vista?

From stackoverflow

• Good Online Book Recommendation

  For Objective C, this online book is really good...
  it was recommended when I took my Cocoa class.

  http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/ObjC.pdf

• GCC is really your only choice, AFAIK. Since pretty much nobody uses Objective-C without the Cocoa/OpenStep frameworks, you can use it with GNUStep on Windows.

  dreamlax : Using Objective-C without Cocoa is like using C++ without STL or Boost. I frequently use Objective-C without Cocoa simply because I find the abstraction and polymorphism easier to comprehend than C++. You're right, pretty much nobody uses Objective-C without Cocoa, but it's not a dumb thing to do.

• Both your questions have been answered previously:

  What are some of the best online resources for learning Objective-C?

  Cocoa and Objective-C resources?

  What are some good resources for learning Objective-C?

  and:

  How can I develop for iPhone using a Windows development machine?