This is basic but I was wondering when you score cardstock (any paper) which way do you fold? One side forms a "valley" (side you score) and the other side is a "ridge". Does the valley go inside the card or outside? Thanks for advice.
When you fold with the valley on the out side, two things happen. You get a nice rounded outer edge with less chance of the paper cracking. You also get a ridge pole on the inside to supply structure to your project. This is especially true with dimensional projects. Take 2 scraps of cardstock and compare.
If you use a tool called a Score-it, the scored side is the inside because it makes a double score. In my opinion it is the best scoring tool I've seen. I don't know if they make them any more. I remember they were quite pricey, but well worth it.