The single crochet stitch is one of the next stitches
that you should learn to make, after learning your basic chain. When
worked in rows, the single crochet stitch gives a tight weave to the
fabric, and I often use Single Crochet when working on skirts or other
garments where I prefer a lot of coverage (and less space between
stitches).
One area where many people find trouble when they first
learn to crochet is in determining how many stitches they have made and
where to insert the crochet hook to being working the next row. Say
a pattern calls for a foundation chain of 40 stitches. Your first
step is to complete those 40 stitches using the chain stitch. Now,
say the pattern reads to (ch 1 turn). This means that before you
begin working on your row of single crochet, you will create one
extra chain. This is called the (turning chain) and is used to keep
your piece in symmetry. So, now you have chained 1 stitch and have
turned your project to begin working on the next row. Carefully look
at your crochet stitches because the very first stitch is not the one you
will crochet in. You have chained 1, turned, and will insert the
crochet hook into the 2nd stitch from the hook. The chain 1 turn
stitch will create the proper spacing for your project.
You will discover that when crocheting, you will always
finish your row, then create a chain 1, (2), or (3) stitch when turning to
work on the next row.