I was just wondering, i dont have this but, when you move your head to one side for example.. how can you see the screen? is there like a pair of glasses with screens or what?

No, your eyes have muscles built in so you can see the monitor in front of your body while turning your head slightly to the side.

The "pairs of glasses with screens" are called Head Mounted Displays (HMDs) and go for around 800 USD these days, including motion sensors.

Vain