Sections report provides you with information about all categories you have on the website. You can change their names and amount using article_categories value in the layout on web pages.
After you select the timeframe in the calendar, you'll get a list of categories with the sum of pageviews and social actions. By default, the list is sorted by PV sum (from best to worst), but you can also filter it by the sum of social actions simply clicking here:
You can unfold each category with a left mouse click if you'd like to get more details about articles in the category.
The link icon near the title is a fast way to get to the article page on your website. The graph at the right is interactive and can show you the number of pageviews on the timeline.