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 Lanas y Ovillos in English
by Under the Olive Tree Knits
by craft's king
by Ani Tugushi
by Love Doing Craft
by Knitting Stitch Patterns
by Popo's Woodworks