Learn to Crochet!
Crochet Gif Tutorials: Crocheting into the Chain
If the first row of stitches after the chain are going to be single crochet stitches (sc’s), you’ll need to crochet one extra chain. If they are going to be double crochet stitches (dc’s), you’ll need two extra, because dc’s are taller and you’ll need more space. Treble crochet stitches (trc’s) require three, etc. A pattern will always tell you what to do!
For a more detailed explanation of the single crochet (sc) stitch used in this example, please see the tutorial here.