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 Om. egvo
by HandyDandyCrafts
by Nidhi's CrochetART
by Art by Amy
by Knitting Stitch Patterns
by MrGeenky
by Sheruknittingcom