If you are a beginner in crochet I suggest you start with A Beginner’s Guide to Crochet. You should start with the basic terms and stitches before diving in this pool of stitches. Once you have covered all the beginner material you will be able to discover and take full advantage of this Crochet Stitch Library.
I have gathered a collection of different crochet stitches and each comes with a detailed tutorial. There are so many crochet stitches available, some even forgotten, so this crochet Stitch Library is by no means complete. Nonetheless, I have tried to include the major ones, and will keep updating them regularly.