Does Yarn Twist matter?
A. If you are a right-handed crocheter, each time you make a standard yarn over (bringing the yarn from behind the hook, winding it up forward toward you, and then down across the front of the hook) you are giving the yarn a bit of Z-twist. When you crochet this way with an S-twist yarn, you are essentially untwisting the yarn as you go. Taken to the extreme, the yarn will eventually lose coherence and stability, fall apart, and look frayed and worn!