Bring your needle up from the back of the fabric, wrap your thread around the needle twice and then hold your thread so it’s flat on the fabric, before putting your needle back into the same hole you came up through originally. Hold the thread flat to the fabric until the last possible second, as you pull your needle through, which will then create a knot on top. They can be a little fiddly to get the hang of, so don’t give up even if the first one doesn’t work!
Fly stitch is an individual decorative stitch.
Bring your needle out at A, and then create a horizontal stitch by putting your needle in at B, but don’t pull your thread all the way through. Bring your needle back out at C, and create a very small stitch, back in at D, to anchor your original loop in place.
Repeat this as many times as you want to build up the texture and pattern. Either keep stitches to an even shape and size, or deliberately vary them to create a different texture.