Projects vs Gems vs Gemini Notebook: the test from the lesson
(Birch Street Auto Repair is made up. The lesson loads three files into each tool: Price list 2026.pdf, Warranty and policies.pdf and Customer FAQ.docx. Below are the lines from them that the answers depend on, so you can rerun the test with your own files.)

THE QUESTION (paste the same words into each tool)
A customer had front brake pads replaced here on Feb 3 and says they squeak now. Is that covered by our warranty, and if not, what would we charge to look at it?

THE LINES IN THE FILES
Warranty and policies.pdf: "Brake repairs: 12 months or 12,000 miles, whichever comes first. Parts and labor."
Warranty and policies.pdf: "Not covered: normal wear, and light noise while new pads bed in during the first 500 miles."
Price list 2026.pdf: "Brake inspection $49 (credited toward any brake repair)"
Not in any file: the customer's mileage. A good answer says so.

WHICH TOOL TO USE
ChatGPT Project: a workspace: your files, instructions and all related chats in one place.
  Best for: your own ongoing work: quotes, replies, planning. It also brings in general knowledge.
  Watch for: extra advice that isn't in your files.
Gemini Gem: a reusable helper with fixed instructions and knowledge files.
  Best for: one repeat job the whole team runs the same way, like customer replies. Share it like a Doc.
  Note: Google Docs you add from Drive stay up to date.
Gemini Notebook: research over your sources, with numbered citations.
  Best for: checking what a document actually says: policies, contracts, manuals. Also briefings.
  Note: it says so when the answer isn't in your sources.
Knowledge base: the one up-to-date home for your documents, like a shared Drive folder or help center.
  Best for: when customers ask, not you: a website chatbot or phone agent reads from it.
  Rule: keep one master copy and update it there first.