You guys probably already know how to tie a tie but hey we we can always learn a few more ways to tie our tie.
I know I looked at these instructions closely again just to make sure that I have been doing it right, apparently I usually do four-in-hand or half Windsor, I only use Windsor when the tie is too long or I want to look extra formal

I have not tried the shell knot but I bet it's good for use with less structured suits and that sort of thing