I use cleat hitch, clove hitch, double half-hitch, trucker's hitch, and BOWLINE.

Bowline is the most important. I never could figure out the rabbit-and-hole technique. I have a super-fast way to tie a bowline, and I can do it right-handed, left-handed and blindfolded. But I don't know how to describe what I do. It's just flop, twist, flip, flip, pull.

Carlton Tucker claimed he could tie the fastest bowline, but I beat him (just barely).