This is an incredible knot site. You’ll find specific knots for all occasions. In each section, there will be a center area surrounded by different knots. If you mouse over the different knots, a description will come up in the center area. You can then choose a knot and you will be taken to its page.
Once you’ve chosen a knot, you will find an animation of how to tie that knot. The animation can be slowed down for easier viewing and you can even flip the direction of the knot so that you can see it tied from a different angle.
http://www.animatedknots.com/