Learn how to speak and fold in the language of origami!
fold the corner back.Unfold. Fold the corner back again, but oposite the direction you just folded in. Unfold again. Now, push in the triagle that you just made.
Note: pocket folds are only posible when you fold back the corners of a OVERLAPING piece of paper.
Creases: The begining of a fold.
To make a sharp crease, put your paper down on a hard surface, so the crease you are making is face up. then, use your thumdnail to pull across the fold. It should make a more permanate, sharper crease.
Note: Before making a crease, make sure that is the way you want it. It is rare that a crease mark, espesially a thumb crease, will ever dissapear.
Pleat: A zig-zag pattern. This is a hard thing even for origami masters to do. A good way to fold this is to fold the paper down, then a part of the fold back up, or the other way around, depending on which way the the pleat is meant to go.