Step 3: Reef Knot
Take an end in each hand.
Pass the left end over the right end (making an X shape) and then loop it under, creating the basic "overhand" knot.
Take the end that you started with, now on your right, and cross it back over the other end, making another X above the first overhand knot, and loop it under and through the centre.
Pull tight, and the knot should be flat and symmetrical, with the two ends you started with both on the same side of the lines.