Why do I need to know the difference between heap and stack?

Question

It's memory. I don't care where it comes from or where it is stored. And it's the compilers job to figure out the best place for my data.

Answer 1

it's more than just memory though. the stack lives and dies with function calls. once a function is called it's variables are pushed onto the stack. once the function ends the rsp returns clearing the stack. the heap however will stay there until it is called to be deleted. the question you have to ask yourself is "Do I want this to be alive for later use"