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
Yes, the component link field supports both internal and external URLs.
Yes, the generated templates can be saved to the database.
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.