When you select a course from the Courses drop-down menu, the Home tab is displayed by default. From the Feed tab, you can view public communications for the course. You can post comments to the public discussion thread, which may include uploaded files, URLs, and polls, as well as reply to posts from other users.
You can also view the Course description within the About Course section. Any important files that have been pinned to the Course Home page will display within the Pinned Items section.