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.
Yes, you can build mega menus using Cohesion. Building mega menus requires advanced knowledge of jQuery in Acquia Cohesion and CSS.
Yes, the generated templates can be saved to the database.
You don't. You apply a Descendant selector. These use a (Space).