Probably the easiest way to communicate with all of your students at once is to use the Announcement feature in Canvas. You can use it to deliver a weekly video lecture, type a note of encouragement, provide extra study material, or clarify instructions for your students.
Everything you could do with announcements is included in this 70-page PDF, How to use Announcements link.
Includes: replies to announcements, announcement management, and sorting, attaching files to announcements, editing, deleting, delaying posting, allow/disallow replies, copying to another course, and more!
When using Announcements to communicate with your students, you want to make sure they are being seen and read, especially if they contain vital course information. The best way to ensure this is to make you choose the correct settings before saving and posting so that the most recent announcements appear on the homepage when students log in.
If you decide to use the Announcements tool to communicate with your students, follow these simple steps to post:
Make sure your webcam and audio are enabled on your computer if you decide to use video, if not, skip this step.
Click the Announcement link in the left-hand menu of your course.
Click the blue "+ Announcement" button in the upper-right part of the page. (see below)
Title your Lecture Announcement appropriately, then add any text in the dialogue box you want the student to see. You can also add photos, attach files, links to research sites, and embed third-party videos that enhance the weekly material. When you are finished, click "Save."