Click the links at the top of the screen to find what you need.
If your teacher has instructed you to take notes on your Chromebook, you can access the files on the left. They are View Only. Click File > Make a Copy so you have your own copy.
After you've made a copy, put your name in the file name. Next time you take notes, open it in Drive instead of making a new copy every time.
If your team is sharing one set of notes, make sure you share the Doc with all of your teammates.