As I already mentioned, you can add to the pointer any number you want to go to the next storage unit. For example:

int a = 1;
int *pa = &a;
cout << pa << endl;

pa++;
cout << pa;

Pay attention that we moved forward to 4 bytes (size of the int type). Such math operation is unavailable for references:

int a = 1;
int &ra = a;
cout << ra << endl;

ra++;
cout << ra;

We changed the value of the variable a but not the reference.

What's the difference between a pointer and a reference?

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Pointers vs References