Photographs, drawings, and explanatory text provide fishing enthusiasts with a useful guide to the materials and methods used in tying a variety of knots
This is just as good as any other knot book. Of course, none of them are any good without sitting down and tying/practicing. It's still difficult to follow pictures to learn but there are lots of knots to choose from.
Well, you have been trying to catch trout for years. Finally, one is hooked and you lose the fish because the knot failed. Oops! You should have read this book first.