How to YO or Yarn Over  

How to Yarn Over or YO

In knitting, yarn over means exactly that. You bring the yarn over the needle and then knit whatever knitting stitches are required after that. It adds an extra stitch between stitches and is used to make a hole for a button or create a decorative element. Doing a yarn over may seem a bit awkward at first, but depending how they're arranged, this knitting stitch can add a lot of variety to a piece.