If you have information that does not require student feedback, etc. You can add it as a material.
1. Go to: Classwork
2. Create Material
3. Title and Description
If you already have a material created, you can click on the Add button, then select the document from either Google Drive, a Link, File from your computer or YouTube
If you press Create, then click on one of the options in the drop down menu, it will automatically create a new document for you and add it as a material.