To use Google Drive not as personal file storage but as an enterprise document-management system, you need to know some principles. The My Drive vs Shared Drives distinction, permission management and version control — critical topics.
01. My Drive vs Shared Drives
My Drive: personal; when a user leaves, the files require ownership transfer. Shared Drives: corporate; the owner is the company, not the user. Corporate files must be in a Shared Drive.
02. Folder Organization
Departments or projects at the top level. Subcategories in subfolders. A 3-4 level depth is ideal; a deeper folder structure causes things to get lost.
03. Permission Management
Google's permission system is layered: Viewer, Commenter, Editor, Manager. It can be set at the file level and the folder level. It's usually defined at the folder level, with exceptions made per file.
04. Real-Time Collaboration with Docs
Google Docs' greatest strength; multiple users can write in the same document at the same time. Comments, suggestions and version history are kept automatically.
05. Version Control
Every edit is saved automatically as a version. With "version history" it's possible to go back to previous states. Versions can be named (e.g. "Before approval").