use just two of these. don't worry about it. the top sheet -- it goes on top. and the fitted sheet goes on the bottom. it covers -- the main part of your bed here is a mattress. the "mattress" is, like, a big fluffy thing that you get to relax on. and the black part of my picture would be a bed frame. let's write that down. it's important. so a "bed frame" is the support of the mattress. pillow, pillow case, sheets, top and bottom or fitted sheets. next: in canada, or maybe in your country, in the winter, it's cold. you want something to cover you. sheets 