I dislike the way they did that. For one you don't need all those include files.
#include <iostream>
using namespace std;
You didn't need any parameters in main, and the way main is initialized as _tmain is confusing.
int main()
{
int x, y, z;
cout<< "Enter the first number: ";
cin>> x;
cout << "Enter the second number: ";
cin>> y;
z = x * y;
cout<< "The product is: " << z <<endl;
return 0;
}
If you are using Visual Studio, the system pause is unnecessary if you "Start without Debugging", or Ctrl + F5.
Also, make sure you don't make variables so ambiguous. Bad style.
The book we were recommended to get in my college course was Absolutely C++. It's probably a better resource then what you have. Another good idea is learning C before C++, it's more basic. A Book on C is a good resource for that.