Once you get into Google Drive you will in all likelihood end up with many, many documents and folders in your drive. Luckily, Google provides plenty of tools in Drive to help you find what you need.
Firstly, the left hand menu:
This is handy for doing a preliminary search. I particularly like the Recent option, which gives immediate access to all the files you’ve lately worked on.
There is also a familiar-looking search bar at the top of the Drive homepage, from which you can perform a keyword search. Remember that when you perform a search in Google Drive you are searching the whole document, not just the filename. It will even use OCR technology to try to interpret the contents of things like images and PDF files.
To the right of the search bar is a down-pointing triangle. Click on it to bring up many more options for filtering your search by file type, visibility or ownership:
If you recall that someone shared a file with you can even search for the file by using that person’s email address, using the owner: keyword within the search bar:
(no space after the colon)