@SETHSAGE ...
The Guide for "favoriting" your courses so that they appear on your Canvas Dashboard can be found at:
As the Guide indicates, if you do not place a star next to any course on your "All Courses" screen, then up to 20 courses will show on your Dashboard. But, as soon as you place a star next to a course on your "All Courses" screen, then that will be the only course that shows. Of course, you can choose more courses to "favorite" with the star, and those will also show on your Dashboard. Some courses, however, you may find cannot be marked with the star. In those cases, hover your mouse over the star, and it should show you a small text pop-up next to the star giving you a reason why the course cannot be marked.
I hope this will help a bit. Sing out if you have any other questions about this...thanks!