Every year I think, "I should look up that diagonal got wrapping thing." And every year it fails to make sense to me. Starting to suspect that Japanese paper and gift wrap are a particular aspect ratio like European paper sizes being 1:√2
Okay I think I figured out about valley folds and mountain folds in origami. I was having trouble getting the folds to match the box edges, then I realized I could fold it over the side, crease it , then invert the fold along the crease so that it stays hidden inside. Still think that box and paper dimensions play a role tho