The Non Slip Loop Knot. Superb. The strongest loop knot you can tie. Used by big game anglers worldwide. Easy to tie, far stronger and more reliable than the old fashioned strangulating figure eight knot that can substantially weaken line.
If I was ever taught this, I don't remember it. I KNOW I was taught that there are "no knots in embroidery" ... so, I learned several ways to fasten thread for needlepoint or cross stitch .... but, for hand sewing (hexis for me) this is brilliant!