The most important aspect of fly fishing is the fly! In this tutorial, learn how to tie a fly to your line for fly fishing. You will learn how to attach a fly to the leader on your line. A fly isn't attached to a fly fishing line because the leader is attached to the fly line, and the fly is attached to the leader. Find out how to moisten fly line to reduce friction and strengthen the knot with help from an experienced fly fisherman in this instructional video on fly fishing equipment.