how pointers work?

Answer 1

int x=20;
int *p;
p=&x;

cout<<x; //output - 20
cout<<p; //output - address of x
cout<<*p; //output - value of x(20)

Answer 2

a pointer stores the address to a variable instead of storing the actual value

Answer 3

pointers are also faster?
modifying the actual variable in memory Instead of loading the variable then modify the variable then store the variable back to memory.

Answer 4

is *p a pointer or p with star (ignoring *)