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.
No. Helpers are coupled with the page once placed. Changes to the Helper layout will not affect existing instances.
The 'Range' in the menu list item element sets which list items at the current level the settings should apply to.
Yes, you can build mega menus using Cohesion. Building mega menus requires advanced knowledge of jQuery in Acquia Cohesion and CSS.
You can use Elements to create content but we don't recommend doing so for multiple reasons.
Opacity is set using a decimal where 0 is transparent, 0.5 is 50% and 1 is solid.