Tying a rope is one of the most practical skills to have in your arsenal, and 99 percent of the time, a bowline is the best knot for the job. Not only does it offer a rock solid hold, it can be tied and untied in seconds, even after bearing tension.
I've listed 25 different tarp shelter designs to help you get started. Each configuration has its pros and cons and there isn't really a perfect design for all occasions. You'll have to chose the righ(Try Design)
"The constrictor knot is a way of making a secure, temporary or semi-permanent binding (it’s a good temporary whipping for a rope, closing a bag, or holding a punch of poles together.)" here's my video on this knot with a no-tangle paracord skein