Some very good discussion here on stack vs heap. Read it entirely. Though it sounds theoretical they are very important when you get to real world problem solving
http://stackoverflow.com/questions/79923/what-and-where-are-the-stack-and-heap

And some more over here for stack overflow: http://stackoverflow.com/questions/26158/how-does-a-stack-overflow-occur-and-how-do-you-prevent-it