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.
No, the entity browser does not work for component defaults as the entities are content, not config.
You can use Elements to create content but we don't recommend doing so for multiple reasons.
Yes, the generated templates can be saved to the database.