Yes Rainboe, I agree with you. We can explain the basics, that's about it.
Rui: as part of your understanding, google or look in the AHM for Mean Aerodynamic Chord, you will see it represented as % MAC. An index is used to determine what the MAC is (index is an easier calculation that MAC). MAC shows the center of gravity on the wing, where 0% is the front, 100% the rear of the wing. There will be a safe range (747F 9% max fwd, 33% max aft). Understanding MAC is critical as the angle on the horizontal stabilisor is set according to weight & MAC. Also know as "trim".
Edit: Take a look here, there are some explanations for you.
Center of gravity of an aircraft - Wikipedia, the free encyclopedia