How to turn a line into a circle and kill it?

First, turn the rope for half a turn, press the rope head under the main rope, then pass through the two vertical ropes, then pass back into the hole below, then pass the rope head back from the bottom of the upper rope loop, and then tighten it.

Common knots: rabbit ear knot, figure-eight knot, figure-eight connection, figure-eight threading knot, figure-eight tying knot, double connection, corn knot and snake knot.