A few years ago a friend shared this website with me. This shows hundreds of knots for a wide variety of uses. You can search for the knots you want to tie and it gives a step by step guide on how to tie it correctly.
Animated Knots is the world's leading site for learning how to tie knots of any kind. From Boating Knots, Fishing Knots and Climbing Knots to how to tie a Tie, or even Surgical Knots — we’ve got it covered.
I recommend this site to many people and hope you find it helpful too.