Question: When I score a piece of cardstock, is the dented side the inside or the outside of the crease?
Answer: It may be counter-intuitive, but the dented side is the outside of the fold. That will result in a crisp, professional crease. So in this picture of a scored box, you fold those score marks in so that the
side you see in the picture is the outside of the box. But if you do it the other way, the world will not end and your project will still look great!