Propagating crown of thorns

Question

You say to cut a leaf straight across to begin with–is this supposed to be cut a stem?

Answer 1

To take a cutting from crown of thorns, cut through a stem 3 or 4 inches from the outer tip of the stem. Choose a cutting that will have at least three pairs of leaves or buds on it. Remove the pair of leaves nearest the cut end. Leave the cutting in a warm area for two or three days till the end callouses over. Then it is ready to insert in potting mix.

https://www.gardeningknowhow.com/houseplants/crown-of-thorns/propagate-crown-thorns.htm