Peppermint is a type of mint. Normally one simply uses the leaves, either fresh or dried. The leaves have the best flavor if harvested just before the plant blooms. Fresh leaves are good in iced teas, lemonade, fruit salad, cucumber salad and so on. Dried leaves can be used in Middle Eastern recipes and tea as well as in baking.
To dry, cut the mint near the base of each stem, tie the stems into bundles using rubber bands at the cut ends. Then hook the rubber bands on bent paper clips and use those as hooks to hang the bundles--hook them onto an ordinary coat hanger, for instance. Hang them in a cool, dark, dry, well ventilated spot until crispy. Then remove the leaves from the stems and store in airtight packages such as jars or zipper bags, again in a cool, dark, dry location. Make sure there is no condensation in the container--that means it is not dry enough yet.