Two types of yarn overs are demonstrated here - a yarn over preceding a knit stitch and a yarn over preceding a purl stitch. Every knitter should have both in their knitting know-how!
by Knitting and Crochet Tutorials
by lacefromireland
by Sheruknittingcom
by Yami Crafting
by PFAFFofficial
by ThePatterfamily
by ABC TV