One future tutorial that I could use: How to tie a tie-nock. I know there's a certain cross-over knot that you're supposed to use, but Iinvariably screw it up, and it comes unwound.
Are you talking about how to serve? When you refer to a "cross-over knot", I'm assuming you're talking about the back wrap that's done at the end of the serving to finish it off clean?