pointer - when to use * and &

#code

three way to use * and &

int* p; // 1. variable p is pointer to integer type
int i; // integer value 
p = &i; // 2. pointer p will point to the integer i
i = *p; // 3. I will be filled with the value of p 

words-words:
int is type
p and i is variable
variable can value variable, or pointer variable

value variable store data
pointer variable store address

1. asterisk on type. it means a pointer type. in the example above, it means pointer of integer-type. This is the only time you use * or & on type.
2. ampersand on value variable. it means the address of that value.
3. asterisk on pointer variable. it means dereference, returning the value of that pointer.