I will teach you how to make an origami sonobe unit. This instructable will be helpful in my other instructables on how to make origami polyhedra.
Step 1: Get the Material
A square piece of paper
Step 2: Fold the Paper (Part 1)
1.) Fold and unfold the paper in half
2.) Fold both top and bottom end edges to the center fold line and unfold
3.) Fold the top left corner to the top fold line and the bottom right corner to the bottom fold line.
4.) Fold the slanted edges of the folded corners to the closest fold line.
5.) Fold the top and bottom edges to the center fold line.
Step 3: Fold the Paper (Part 2)
1.) Fold the bottom left corner to the top edge
2.) Tuck it under the flap
3.) Do the same for the other side
4.) Flip it over
5.) Fold the corners to the farther corners (reference to the picture)
6.) Fold back in half the paper along the line space between the two flaps
7.) Let go of it and it should look lke a zig zag from an overview. If it is, you have successfully finished.