Which knots are used in fly fishing? How do I tie fly fishing knots? These are two of the fly fishing questions I get asked most often. Even my father-in-law has asked me—his biggest holdup with his fly fishing hobby was that he couldn’t remember which knot to use, or how to tie the knots. So I thought I would talk about the top six fly fishing knots that everyone should learn in order to become a better angler. Most of the time, you will only need two of these knots (the Double Surgeon’s Knot and the Improved Clinch Knot) because as soon as you get a few of them tied you will not need to tie them again until you’re changing out your fly line, which doesn’t happen that often.