The editing area is clearly structured. On the left side is an overview of all available content types that you can create and edit (e.g. courses, lessons, media, etc.). If you click on one of the content types, the respective content is selected and the existing entries are listed. These can then be edited individually. This principle is repeated for all content.
Note: You only have access to the content in the editorial system that you have created yourself. The content of other users is not visible to you. Likewise, your content is not visible to other users.