I'm not a fan of Google Classroom. Instead I prefer OneNote(but I don't bother with the Class Notebook option) to which I add class notes, website addresses, chalk 'n' talk pages etc. Here's how I set mine up. Be aware that when students are working on assignments they do this in the Google Drive folder I've set up and shared with them - see further down the page for more on this. Note, anyone with Windows 10 will have MS OneNote preloaded. Otherwise you can access it by logging into Microsoft Office 365 using your school email and password (as can your students).
Set up your digital classroom for assessments.
A bit quicker for the pro's!
Securing final copies
To show to your students! Organisation and sharing.