Canvas is another common Learning Management System (LMS) through which teachers share assignments and resources, grade tasks, provide feedback, and communicate with students. As a substitute teacher, you may be given teacher or teacher assistant (TA) access, view-only access, or you may not be given access at all. Regardless, it is helpful to understand the functions of Canvas to orient yourself to the functions so you can support students who are working within this LMS.
If you are a daily substitute in a district that utilizes Canvas, you will most likely be added to the course as an observer, so it's a good idea to keep the Canvas Observer Guide Table of Contents accessible.
If you are a long-term substitute, you will likely be added to the course in Canvas as a teacher/designer. In these cases, the Getting Started with Canvas as an Instructor page will be a valuable guide.