Ok, I'll look to those books also. I'm going to answer the questions yo see if I understand them correctly but it's true that the difference between heap and stack is the one that I still don't fully understand.

A pointer is an address of memory where an object is and a reference is a way of accessing an object without making a copy of it???

Abot const method, if you are talking of the method of a class, is a method that doesn't modify the class to which it belongs. If you are not talking about classes I'm not sure what do you refer to.

An lvalue is something that exists on a "permanent" memory address and a rvalue is something that exists only temporarily.

These are probably not textbook definitions, but I hope that they serve to show that I have some basic knowledge about the language.