What are Content Categories?
Content Categories determine what you see in your news feed. Your Community Managers organize the content in your platform into different categories. By default, you see all the content that has been set up for you, and you have the option to filter your content by selecting the categories you want to see.
Your Category Subscriptions to the left of your News Feed show the categories to which you're subscribed.
The Manage Subscriptions link takes you to your list of available News Feed content. Click it to go to the Manage Subscriptions page, where you can select which Content Categories you'd like populating your News Feed.