The most common situation in which you will be asked to make a yarn over in your knitting career is between two knit stitches, but that is not the only way to do it, as this tutorial explains.
First, however, we'll cover the most basic: a yarn over between two knit stitches.
All you have to do to make a yarn over between knit stitches is bring the yarn around the right-hand needle from back to front, wrapping counter-clockwise around the needle and taking the yarn back to the back before knitting the next stitch.
