Hooks are essential tools in fly fishing, used as the base to tie artificial flies. The process begins by securing the hook in a vise. A thread is wrapped around the hook shank to create a foundation. Materials like feathers, fur, and synthetic fibers are then tied to mimic the appearance of various insects or baitfish. The specific pattern and combination of materials depend on the type of fly being created, such as dry flies, nymphs, or streamers. Hooks come in various shapes and sizes, each suited to different fly patterns and fishing conditions.