This near-essential knot is used for tying a permanent loop, often in the butt section of your leader, so you can attach it to the fly line with a loop-to-loop connection (below).
Check out the step-by-step animation or the video below:
Making a Loop-To-Loop (or Handshake) Connection
Another must-know, this is the easiest way to attach a leader to a fly line.
Double Surgeon’s Knot
The double surgeon’s knot is used for connecting two sections of monofilament (or fluorocarbon) leader material. It’s quick, easy and works on line of moderately unequal size, making this a great knot for constructing leaders.
Check out the step-by-step animation or the video below.