Single Crochet (sc)
The dense, versatile stitch used in amigurumi and garments.
Insert hook into next stitch, under both loops.

Yarn over, pull up a loop (2 loops on hook).

Yarn over, pull through both loops.

The dense, versatile stitch used in amigurumi and garments.
Video tutorial showing single crochets into a chain (CC BY-SA 4.0).