The Canvas gradebook has many features that are useful for providing feedback on various types of assessments and assignments.
In the following video, we will review how to grade assignments, provide feedback (comments) as well as how to provide annotated feedback (mark-up and comments) using the SpeedGrader.
Whenever you create a new graded assignment, you will get a corresponding column in your gradebook. Use the cells  in the grade book to input grades for your assignments. All assignments must be entered as points but you can change how the students see the grade in their gradebook (e.g. percentage, letter grade, etc.) or you can ‘Mute‘ the column so students won’t see the grade at all (you can always ‘unmute’ or reveal the grades to students later.)
You can provide feedback and comments on an assignment by clicking on the comment icon  in the corner of a gradebook cell. Comments are great for short notes and questions. Students can respond to your comments, and the conversation can continue for the duration of the course. The comment will appear on the Dashboard, on their “Grades” pages, and in the comment stream of the SpeedGrader display for the assignment.
Canvas has a tool called SpeedGrader which lets you quickly preview, comment and/or annotate a student’s assignment submission. Using the SpeedGrader and the Crocodoc toolbar, you can mark-up and add comments. NOTE: If you use the SpeedGrader, make sure you tell your students to click on the ‘View Feedback’ link when they view their submission grade in order to see ALL annotations and comments made on their assignment.
If the assignment being graded is a TurnItIn assignment, you can access the TurnItIn Originality score and report by clicking on the TurnItIn score icon  in the gradebook. Once you view the TurnItIn Originality report, you can use the TurnItIn Grademark tools to provide annotated comments and feedback.