If you have rectangular paper, fold one corner down to the opposite edge and cut off the excess strip.
Fold the square in half diagonally both ways, then unfold, creating an 'X' shape. how to make a paper box
Thin to medium-weight paper works best; heavy cardstock can be hard to fold. If you have rectangular paper, fold one corner
Fold all four corners into the center point to create a smaller square. If you have rectangular paper