In Vastu shastra the directions are the very most important subject. Without knowing the directions we cannot find out the mistakes as per vaastu shastra in the premises. Directions are nothing but heart of a human body. Heart is most important to a human body, like wise directions also important to the vastu shastra. How to find out the directions, its very simple to know.
Stand before Sun, that is the East, i.e, you are viewing East direction, your back side is West, left hand side is North and right hand side is South.