This was made after watching various YouTube videos it is cheap and affordable and so far has worked well

Step 1: Preferred Method

This it the best way of tying it that I have found it uses one length of cord and works well I know I said that this wa a knotted system but it does need knotts to secure it but they make sure the rope doesn't tangle or lose tension please give feedback and I will try and improve this system the two rings represent trees however I plan on making two and then it will be easier to hang the tarp