Can I revision my templates, styles and components?
Yes. You should revision your Acquia Cohesion assets like other configuration using a service like Git.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
If you're removing styling from a base style, those styles still apply until you have saved the base style.
Base styles are CSS styles for HTML elements.
Running the composer update command will update any composer packages that have newer versions available.