c Language & The difference between the address pointed to and the address pointed to by the pointer

The following code is given directly

hypothesis 0x80000 The value of the address is 5,int *p ,p The address of this variable in memory is 0x8abcd,
that p == 0x80000;*p == 5; &p == 0x8abcd;

p The address pointed to is 0x80000, That is to say p = 0x80000;
If required 0x80000 The value of the address , Just use *p;
&p Is to seek int Pointer variable of type p Their address , This is a secondary pointer , namely int **a = &p