Notifications can be edited to better suit your needs.
Click account
Click notifications
Email notifications are ones that you will get sent to your email on a specified basis (daily, weekly, etc.)
Push notifications are ones that will pop up on your phone, or as a banner when you first log into canvas as shown at the top of this photo.
When you click on the notification you want to adjust you will get this drop down menu that gives you option to how often/when you would like to receive the notifications