The Assignments tool in Canvas allows an instructor to create and track all of the assignments in a course and shows students all of the activities that will be expected of them and the points for each activity.
In Canvas, gradebook set-up is contingent on the creation of assignments and assignment groups. It is fairly accurate to say that in Canvas, Assignments and Gradebook are different aspects of the same tool.
Any Assignment you create and publish on the Assignments page will automatically show up in the Grades, Calendar, and Syllabus features so students can view them.
The reverse is also true: any Assignments you create in the Calendar will automatically show up in the Grades, Assignments, and Syllabus features.
All gradable items, such as assignments, discussions and quizzes can be created directly in Assignments. You can also create quizzes and graded discussions in their own tool; each item will show up as an assignment.
Each item created in Assignments needs to be placed within an Assignment Group to set-up grading rules and weight grades.
See the complete list of Canvas Guides for Assignments and Grades.