The purpose of tags is to structure and organise the content in the Class Feed.
Any participant in a class can add tags and edit tags on a post so that it is easily retrieved in the future. You can add as many tags as you want on a post.
To add a tag on a post, click on "Add a tag" in the top right of a post, start typing and either select from the dropdown if your tag already exists or tap enter to create a new tag.
When searching, you can then filter search results by tags.