Terminology
A few key terms
Operating System: Windows, Mac OS X, iOS, or Android, among others. This is the main system that lets you use your computer or your phone.
File Manager: an application included with most operating systems that lets you view, open, save, and organize your files. (Most of the time you will encounter your file manager in the context of saving a file from some application or downloading something from the internet.) In Windows, the file manager is called Windows Explorer. In Mac OS X it is called the Finder. In Android and iOS it is called Files. If you don't know how to use your file manager, learn. Doing so will save you a world of hurt.
Office/Productivity Suite: Microsoft Office and Google Workspace, among others. These are collections of applications that help you do your work.
Microsoft Office: the productivity suite that, for AMBS purposes, consists of Microsoft Word, Microsoft Excel, and Microsoft PowerPoint. (Be sure you catch the distinction here. Microsoft Word is part of Microsoft Office, it is not the entirety of Microsoft Office.)
Google Workspace: the productivity suite that, for AMBS purposes, consists chiefly of Gmail, Google Calendar, Google Meet, Google Chat, Google Drive, Google Docs, Google Sheets, and Google Slides. (Be sure you catch the distinction here. Gmail is part of Google Workspace, it is not the entirety of Google Workspace.)
Google Drive: The part of Google Workspace where you store your files--of any type. (Google) Drive is happy to store things created in Google Workspace, in Microsoft Office, and in many other formats including audio files, video files, and PDFs.
(Google) Drive File Stream: an application that runs on Windows or Mac OS that lets you view, open, save, and organize your files stored in Google Drive from with your file manager. Drive File Stream is a window into Google Drive--the files are not actually stored on your computer; they're just visible to you there.
Web browser: Chrome, Firefox, and Safari, among others. This is how you view web pages, including Google Workspace applications (even Google Drive). You may think you know how to use your web browser, but you might not be using at as effectively as you could be.