(You must have a Google Mail account to create a Google Document)
Picture three show a set of "9-Squares" or Marshmallows. These are not so you can get back to your drive, though. This is so you can choose grid view or list view. List is just that , a list of the documents you have access to and grid view is an actual visual of your documents similar to what is running across the pictures.
Picture Four shows a folder. When you click on this folder, Google opens up the next picture, Picture 5. It shows your folders and where everything is located that you have stored. It starts with "My Drive" where all of your personal stuff is stored. Then it goes to Team Drives. This is where items shared with the entire school are placed. Next you have "Shared with Me" where anything that has been shared with you is available. Starred is a place for favorites. Recent is only useful if you recently used the item you are looking for. Uploads is just that, anything you might have uploaded.
Notice to the left is another look at the Google Drive. Same angle, but a different look. This happens when you click on My Drive. It is next to impossible to lose something in your Google drive. If you can't find it, keep looking, it's there. It automatically saves and its stashed somewhere safe.