How do I integrate social metadata with Acquia Cohesion?
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.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Yes. You can create AMP pages that use the Layout canvas for content but there are a number of considerations.
Custom styles are CSS styles for classes.
The Youtube video embed is responsive so it should expand to the width of its parent. If you do need to set a width you can apply the Width CSS property through the Style Builder.