How to Crochet - All About Stitches
The illustration above shows how to count the chain stitches you have worked. When counting chains, do not include the slip knot at the end or the loop on your hook as a stitch.
Each crochet stitch has 2 loops on the top of the stitch. The illustration above identifies these loops. Usually, you will insert your hook under both loops of the stitch in the previous row. Sometimes, to create a decorative effect, a pattern will indicate to work in either the front loop or back loop of a stitch.