I used the animatedknots but netknots looks like a good one too. I usally froget how to tie up the dropper knot. I only use it to tie up rigs for ocean bottom fishing. I'll put three dropper knots in a leader then add shrimp flies or plastic worms. I tend to forget that knot, not that it is hard it's just that I don't use it a lot. The funny thing is that the two sites each have a different way of tying it.