Although content can be separated vertically using the Vertical Line widget, it is not the best way to do it.
If related content is being separated the auto column or column wrap widgets are a better solution.
To separate different content types, the appropriate HTML5 element should be used for each using the box shadow function to provide visual separation if required.
Sidebar content should be enclosed in one of the Aside element widgets. There are three of these in the Layout section for text, text wrap image and an aside with heading, full width image, caption and descriptive text.