Why use pointers?

Question

I know this is a really basic question, but I've just started with some basic C++ programming after coding a few projects with high-level languages. Basically I have three questions: 1. Why use pointers over normal variables? 2. When and where should I use pointers? 3. How do you use pointers with arrays?

Answer 1

1) Requires less memory to pass data to subroutines as well as on the heap

2) As often as possible

3) It's simple, Just assign the array name to a pointer of the same time

Ex. int A[10];

int * Aptr = A;