The hair grows from the root to the top and its direction is established by the placement of the hair. Hair on the face generally grows in the direction lines provided by the face, down way. There can be some shreds of hair that grow in a different direction. In this case, if you want to grow a beard this should not be a problem because hair generally grows down ways there. On the cheeks you can have a problem. But you can always shave that hair down. The scalp hair growth direction is the same, form the root to the tip and its direction can sometimes be random.
Because it is a very smooth hair, you can use products that will make your hair take any direction that you want. So basically, hair grows on the scalp up ways when it’s small and directs it’s self down ways when it can’t support its weight any more. Having a fore centimeter hair can be very annoying because this will take any direction that he wants. So, to calm it down a bit, it would be best to use conditioner and styling products.
Hair growth on other parts of the body, like the axils or the legs, has the same direction, from the root to the tip. On the axils it’s positioned more up ways and on the legs down way.
Basically, when you wax, you place the wax from the knee down and pull from the feet to the knee. But hair can grow diagonally on the back of the leg for a better protection of the skin, and can be rater hard to wax. For the axils, the direction is the same, from the hand to the body the wax is applied and pulled from the body to the arm.
When hair grows randomly on the body, the best way to get rid of it is by wax or laser. Both these methods leave a thin hair behind, and in the lasers option no black hair what so ever.
Hair grows in the direction that the hair follicle is set. Generally, on one part of the body, like the legs, all follicles are positioned in the same direction.