Learn How to Crochet - Making Crochet Fabric
To make a flat crocheted fabric worked in rows, you must begin with a starting chain. The length of the starting chain is the number of stitches needed for the first row of fabric plus the number of chains needed to get to the correct height of the first stitch used in the first row.
When working in rows, right-handers work from right to left and left-handers work from left to right, turning the work at the end of each row. One or more chains must be worked at the beginning of each row to bring the hook up to the height of the first stitch in the row. The number of chains used for turning will depend upon the height of the stitch they are to match.