The single crochet is the most basic crochet stitch for making fabric. All the other stitches are variations on this one.
Make a foundation chain one chain more than the number of single crochet stitches called for.
Insert hook from front to back in the center of the second chain from the hook (2 loops on hook).
Wrap the yarn, from back to front, around the hook (this is called yarn over and is abbreviated yo), draw the yarn through the chain (2 loops on hook).
Yarn over once again. Draw through 2 loops on hook (one single crochet complete).
Insert hook in the center of next chain, yarn over, draw yarn through stitch, yarn over, draw yarn through 2 loops on hook.
Repeat across to end of foundation chain. To begin the second row, turn your work. Chain one for the turning chain (does not count as a stitch). Insert hook from front to back under the top 2 loops of the first single crochet in the row below, yarn over, draw yarn through stitch, yarn over, draw yarn through 2 loops on hook (first single crochet complete). Repeat this step in each single crochet across.