Every few years I relearn how to make an origami crane. It's not a skill that sticks with me for some reason, like riding a bike or solving a Rubik's cube.
There are lots of bad instructions for how to make a paper crane. I actually enjoy writing out instructions for things. I like taking notes, and I like arranging ideas so they are clear, so I get irritated when I come across instructions that are hard to follow, and most step by step directions for paper cranes are terrible. I must have about half a dozen different versions available at home, and they are all different and they are all unnecessarily confusing. The first time I really was able to fold an origami crane was when I took an existing one and systematically unfolded it, and once I understood it backwards I was able to do it forwards. But as I said, that knowledge doesn't seem to stick.