Some basic and useful knots.

Ropes and knots are among the most ancient and useful technologies ever developed by man, predating the wheel, the axe and probably also the use of fire.Kris De Decker
Reef Knot or Kreuzknoten
Palstek or Bowline
Fast method to make a Palstek using a Slipstek as a base.
Figure of Eight
Double Figure of Eight