Step 1: Prepare two ropes, the black one is folded in half, and the blue one is wrapped under the black rope and crossed on the black rope.
Step 2: Pull the black rope from both sides at the same time to form the first knot.
Step 3: Repeat Step 1 and Step 2 and tie two knots.
Step 4: Wrap the black rope around the blue rope before and after the picture.
Step 5: Tighten the black rope. Repeat step 4 on the other side, winding once in front and once in the back, and then tighten.
Step 6: Repeat one or two steps after tightening. After repeated dozens of times, the two ends are combined into a slipknot. A bracelet is enough.