For someone who claims to be interested in spinning, I know very little about it. I've recently learned that the yarn basically twists one of two ways: s twist or z twist. If you look at a some yarn, the fiber appears to twist to the left like the middle of the letter s or to the right like the middle of the letter z. This is important to know when you get into plying. Plying involves combining more than one single. When you ply, you do it in the opposite direction from the way the singles were spun. If the singles were spun with an s twist, the plying is done with a z twist, or vice versa.
I haven't managed to do plying very well so far, but I have made it to the end of the alphabet. Yay!