From the Google Official Blog:
Just like the Loch Ness Monster, you may have heard the rumors about Google Drive. It turns out, one of the two actually does exist.
Today, we’re introducing Google Drive—a place where you can create, share, collaborate, and keep all of your stuff. Whether you’re working with a friend on a joint research project, planning a wedding with your fiancé or tracking a budget with roommates, you can do it in Drive. You can upload and access all of your files, including videos, photos, Google Docs, PDFs and beyond.
Google Drive continues to add new resources and at times it is confusing for folks to know where to go. This three page document provides you with a great visual of all the components you find when you log-in to Google Drive as well as an additional two pages that share Keyboard short-cuts as well as some other tips. One tip that was new to me is:
* Google Drive file types (docs, sheets, slides, etc.) DO NOT count against your Drive storage space.
This site will also lead you to a Google document that has this information that you may save in your Google Drive.