This how-to will take you through the steps to create a beautiful contrast edge in single crochet. To begin, insert the hook into the first stitch, wrap the yarn aroud the hook, and pull it through. You have one loop on the hook

Make 1 chain stitch to being the row.

Work across the last row in regular single crochet.

When you get to the last stitch of the row, work two more single crochet stitches into this stitch.

You have now turned the corner. To work across a side edge, inset the crochet hook into the space between the rows. Keep working around the edge, and when you get the the beginning, use a slip stitch to connect the last and first stitch of the edge trim together.