Canvas considers three activities as assignments: graded assignments, graded discussions, and graded quizzes. To add an assignment in Canvas, instructors click the plus sign in a module header, select new assignment, enter the name, and add the item to create a placeholder. They can then open the assignment from the module, click edit, enter instructions, set submission type and other details like due dates, and save and publish to make it visible to students. Assignments must have a due date to appear on the course calendar.