Where can I find information about spinning yarn and weaving?

Yarn-overs are a neat way to slip stitches without having to pass the yarn in front or back. Instead one makes a tucked stitch, in which the yarn over and the slipped stitch are knitted on the next row. In effect, the yarn passes over the slipped stitch, rather than in front or back; it's "tucked away". This is the basis for brioche knitting.