Here's how to work a French knot!
Bring your needle up a 1. Holding the thread taut between your finger and thumb of your left hand, wind the thread around the tip of the needle twice. Still holding the thread taut insert the needle close to 1. Pull the needle through to the back of the fabric so that the twists form a knot on the surface of the fabric. Don't pull the thread through the fabric too hard or the knot may follow! Why not try out the mark making exercises in the last photo!
I am having a problem replying back to comments on the blog at the moment so I would like to say thanks for all your comments about my tutorials. It is great to hear that the photos are clear and that the explanations can be easily followed! I think some embroidery how to books just don't show enough steps or are not close enough, so I am glad that I can help especially if you are beginning embroidery or just getting back into it again!