If I change a Helper layout, will it change where it's used?
No. Helpers are coupled with the page once placed. Changes to the Helper layout will not affect existing instances.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
You can integrate social metadata as you would on a traditional Drupal setup. Information within the layout canvas can not be used as social metadata.
No, there are some known issues when using Acquia Cohesion with AMP, which we are working to resolve.
Running the composer update command will update any composer packages that have newer versions available.