Demonstration of YO, YFWD, YON, YRN, YFRN as well as multiple yarn overs, and fixing a missed yarn over or an unwanted yarn over. You can get the printout here: https://www.scribd.com/document/95370723/yarn-over-101#download&from_embed or
http://www.sapphiresnpurls.com/2012/05/yarn-over-101.html