Demonstration by hand. First make a loop
and twist the loop anti clock wise
Pull little loop thru and pull knot tight.
That’s a fig 8 knot.
Demonstration by Preston Loop Tyer. Make a loop and hook the loop on your forefinger. Hook the Loop with the Preston Loop Tyer between your thumb and forefinger.
Turn the Preston Loop Tyer one turn clock wise and hook the first loop
Drop the back loop from the second finger on the Preston Loop Tyer and pull tight