What are style guides?
Style guides provide site builders with the tools to create theme-specific settings which affect the style and layout of a website.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Yes. You can use style guides to create theme-specific styles.
The 'Edited' tag shows that the value of the field has been edited.
To create style guides go to Acquia Cohesion > Style guides
You can create more than one template to provide layout and style alternatives with the use of the template selector.
Yes, this is possible by creating a custom element.