Everything attaches to the project: IAM, billing, quotas, APIs.
Three identifiers, only one of them permanent.
Project ID
Immutable, globally unique, used in API calls
Project name
Mutable display label, not unique
Project number
Auto-assigned, used internally by some APIs
Deleting a project schedules a 30-day soft-delete window, not instant deletion — a real cost trap if a billing account stays attached to independently-billed resources during that window.
Region vs. zone
ConceptWhat it is
RegionIndependent geographic area (us-central1)
ZoneIsolated deployment area inside a region, own power/cooling
Not every product ships in every region on day one — verifying regional availability before designing is an explicit exam-guide consideration.