There are three basic knots one should know as a windsurfer as they can come in handy at one time or another. There first is the square knot. The square knot is the most useful of the three I will talk about as it is what we use when we need to unite two rope ends. This can help us out of a pickle when the downhaul or the outhaul line tears on the water. Make sure you have control of this knot.
Here is the sequence for a square knot:
