You can edit your own content such as text and images if necessary on your website. This keeps your content fresh which keeps search engines happy. . These tools are called Content Management Systems and there are several different solutions available at varying cost that can fit your needs.
Keep It Simple
It is my opinion to keep your editing of your content as simple as possible. Images for instance can be problematic because if you are not familiar with editing images there is a possibility that you will cause problems with the way your website looks. A too big image will push other elements around and the page flow will look terrible. A too small image will just look awful and out of place. Also, text should editing should be kept to a minimum. If you really need to say something on a regular basis, then a blog would be a great solution for you.