I am now entering my 2nd year teaching with canvas. I have used google classroom for the past 2 years and made the switch to canvas last school year. My main reason to make the switch was so that I could still teach and facilitate my class while I was on maternity leave. Canvas allowed me to house everything for my class in one place. I could assign work, give feedback, assign supplemental work & resources, grade the work & push it to my gradebook all in one place!!! It also allows me to reduce student internet traffic and better monitor technology usage by embeding my videos, PDFs and google products right on the page. This way students do not have to even leave the canvas website! And the best part is once you have your course built, you can copy it to the next year!!!! You can then spend the time you would use planning to do one of the other many things that you need to do!
