Do I have to use IMCE?
No. Acquia Cohesion allows the site builder to select, either use of IMCE or Entity browser for browsing and selecting images.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
We recommend using decimals e.g. 1.3 as this makes the line height relate to your font size.
It depends on the font you are using. If you have individual files for each font, you should upload zip files for each weight.
You don't. You apply a Descendant selector. These use a (Space).