Why aren't my base styles updating in the preview?
If you're removing styling from a base style, those styles still apply until you have saved the base style.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Base styles are CSS styles for HTML elements.
No. Helpers are coupled with the page once placed. Changes to the Helper layout will not affect existing instances.
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.