If you are wondering why you can edit some pages but not others, or why a colleague can create content types you cannot, the answer comes down to two separate settings on your account. Your platform-wide role travels with you everywhere in the CMS and determines the kinds of content you are allowed to build and whether you can do site-wide tasks like sending alerts or managing Student Organization Leaders. Most people have the CMS Author role, which everyone receives automatically on their first login.
Your site-group permission is more local. A site group is the collection of pages that belongs to one area of the college, and within each group you are set as a Reviewer, a Publisher, or an Admin. This is what decides whether you can view, edit, or publish that group's content, and a person can hold a different level in each group they belong to. The two pages below explain each setting in full.