When you login to D2L Brightspace, you will be on the Organizational Homepage. You can find courses you are in by scrolling down to the "My Courses" widget.

You can also find your courses at the top of the page by using the "Waffle" or Course Selector icon

If you click on your name at the top right of the page, you can change your profile, settings, and notifications. 

You can also view messages and other notifications by using the envelope and bell icons at the top of the page.