Y would i ever want to declare a variable from heap than declaring in normal way(i dont what its called? :D)

Answer 1

variables that are defined in program statically
which are normal variables not defined by New operator placed in stack memory area.

Answer 2

so if I define int a = 10 in the main function ,it will go in stack ?

Answer 3

yes

Answer 4

Stack is for local variables defined in a function I guess