Versions, Environments And Publishing

Each time you publish, GTM saves a numbered version with whatever name and notes you give it. That history is your safety net: if a change misbehaves in production, you can republish a previous version in a couple of clicks.

Environments

Environments let you point a specific version at a specific site. A common setup runs the latest version on a staging environment for QA, while production keeps the last approved version, so you can validate on a real site before going live.