Seconded. The trucker's hitch is super useful, but most people have no idea that such a thing exists. Knots are good technology. Everyone should know a few, and

Seconded. The trucker's hitch is super useful, but most people have no idea that such a thing exists. Knots are good technology. Everyone should know a few, and this one is in the top four. But I agree with others here who've noticed that you need to practice frequently to keep from forgetting them.