When installing the camp is enough for me all four nodes. They are fairly simple. It is exact easier for Theoretical Physics. Of course, these sites can be used outside the context of installing a hammock. Who knows, maybe in life you will find them used. With me it happened.
For the training you need to meter piece of rope (or repshnura) and a little time.
Super quick and easy Siberian Hitch knot
How To Tie The Tautline Hitch