What is the best size of rope to learn about tying complex knots

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Considering it takes deliberate, relatively precise effort to tie a knot, how do cables randomly become knotted and tangled over time, even if folded beforehand? - Quora

Is clove hitch the best knot for fixation? - Quora

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2. No matter how you stretch a rope, it still curves down at the center when you hang something on it. What explains this? - Quora