Create, upload, version, rename, move and delete
Versioning is the one to use deliberately: a new version keeps the history and the link, where a new file keeps neither.
Drive is file storage with sharing that is actually enforced — fifteen permissions over creating, sharing, revoking, commenting, restoring and downloading, rather than one "can access files" switch.
File storage with sharing that is actually enforced — 15 permissions.
Versioning is the one to use deliberately: a new version keeps the history and the link, where a new file keeps neither.
Three widths of sharing. Share with a team rather than with its members, so the access follows the team when somebody joins or leaves it.
Revoking is its own right, and the one that gets neglected. Review shares when somebody changes role, not only when they leave.
Comments live on the file and folder, so the discussion about a document is attached to it rather than in an email thread beside it.
Deleted items go to a bin they can be restored from. This is the answer to most "it has gone" reports, and it is worth telling people it exists.
Sending from Drive into Chat keeps one copy of the file with its permissions intact, rather than an attachment that has escaped them.
Viewing a file and taking a copy of it away are different acts with different risks, and here they are different permissions.
The capability list this guide is written against, unabridged. Nothing above adds to it.
Drive on the Productivity pageThe modules Drive hands work to, or takes it from. Most problems that look like one module are a handover between two.