Although it is so easy to grow your own herbs inside your home or backyard, preserving and keeping those herbs useful for a long time is not that easy. Many people may prefer to dry their herbs and keep them in a container in case they are needed at any time, but some herbs, when dried, will lose their healthy properties and lose a lot of their mass. The link below has other methods to preserve herbs, check it out:
The Nickel Pincher: Easy Ways to Preserve Herbs
Fortunately, there are other options that you can try that will preserve your herbs and keep their benefits at the same time such as making homemade herbal butter, herb flavored bottles of vinegar or oil.