Need a macrame refresher? Half knots and square knots are the most basic elements of macrame, and once you get in a rhythm you hardly have to think about how to do them. (At that point, thinking usually gets in the way, as so often happens when someone asks how to spell a word that you usually know how to spell until someone asks.)
At any rate, I had created a detailed step-by-step pictorial a while back for making half knots and square knots and decided I'd freshen it up some.
I'm sure there are more professionally photographed and detailed instructions to be found, but I kind of like mine anyway. Go ahead and click on the image at right or this LINK, and scroll through at your own leisurely pace.