Lists allow you to create a list of companies for different purposes. For example, you can have a list of your target accounts for this quarter, companies from a particular industry, etc. It is the same concept as followed companies, broken down into a list view. Unlike followed companies, you will not receive email updates (e.g., Daily Digest) for companies in lists.
Clicking on Metrics in the upper right corner will provide you with the Databook Score, TSR, Revenue, Growth, Profitability, SG&A Margin and Gross Margin overview for listed companies.