The earliest appearance of rope can be traced back to tens of thousands of years ago. When humans began to have the simplest tools, they would twist grass or tiny branches into ropes. People use it to bind wild animals, tie thatched huts, make belts and tie grass skirts ... So, there is a "knot", which records events by tying knots with ropes. This is how people remember things before the birth of words.
3, the red line is specially tied to the ankle of the lover you hit, so the red line is tied first to increase the edge, and secondly to ward off evil spirits.