Step 1: What You Need
Paracord or any string like objects,
First, you need to make a circle and lace one end through the circle like the begning of tying your shoe. (do not pull tight, keep in a circle)
Next, Lace each end one more time and pull really tight. Now what you have is a simple Corkscrew knot.
You can create a longer "corkscrew" by on step three instead of lacing one more time, you loop it as many times as you want or can. ( warning, the more loops you have the harder it is to pull tight)
A fun thing with this knot is, it is very hard to unknot go ahead try it. If you can easily get it Congrats if you can't just keep trying. If I tell you it would be no fun.