Learn to Crochet!
Crochet Gif Tutorials: Crocheting into the Chain
Patterns will always instruct you to chain at least one more chain than the number of stitches your project will be wide. The extra chains act as a sort of ‘turning stitch,’ and give you the leverage to place a new stitch right on top of the previous one.
If the first row of stitches after the chain are going to be single crochet stitches (scs), you’ll crochet one extra chain. If they are going to be double crochet stitches (dcs), you’ll need to make two, because dcs are taller and you’ll need more space. 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.