After reviewing this video, you can check out more detailed written Guides all about Discussion topics. To find these Guides, click on the "Guides" menu at the top of any page here in the Community, then select "Canvas LMS". Next, select the red "STUDENT GUIDE" icon. Click on "Discussions" from the list at the top of the page, and you'll see a bunch of Guides all about discussion topics.
I hope this information will be of help to you, Gabrielle. Please sing out if you have any questions about this information. Thanks!