Knot or Rococo Stitch and its variants.
We pull the needle halfway through the front side of the fabric. On the part of the needle we have pulled out, in other words, the tip of the needle, we roll the thread two or three times. It shouldn't be too tight since we will insert the entire strand of the thread left on the back of the fabric through it.
We insert the tip of the needle on the fabric a few threads ahead of the Stitch where we pulled the needle. Grabbing the rolled thread with the left hand, we pull the thread to form the knot.
Knot or Rococo Stitch Variant.
Line of knots. We follow the same procedure described previously to make the first knot. When we are done, we pull the needle through the front side of the fabric attached to the Stitch we made. We place the thread to the right in the form of a ring holding it with the left thumb. We insert the needle once more making a small, flat horizontal Stitch grabbing a couple threads of the fabric. We pull the the thread trying to make this as tight as possible. We repeat the Stitch knot again until we finish the task.