In this video, you can learn how to tie a uni knot. He uses a snap-hook and a blue rope to demonstrates. He pulls the rope through the hook and makes a loop that crosses over the two pieces of rope. He pulls the rope through the hole six or eight times. Then pull on the hook to tighten the knot. When you pull the rope, the knot slides up to the hook. He explains that the uni knot can be used to loop a fishing line onto a hook or over a reel. It can also be used to tie two lines together making one uni knot and then creating a second one that loops through the first one. The uni knot works very well for tying fishing lines in several different ways.