The dashboard, accessible by clicking the button to the left (#1 on the screenshot above) will provide you with charts and statistics on all your quote activity. You can filter the statistics by date (#2), you can choose which date to consider when filtering by date (#3) and you can choose to see statistics for the entire company or for a specific user at a time (#4).
Further explanation for #3: You can choose to filter the quotes by date and consider one of the following dates when doing so:
So say that you want to see quotes from the past 30 days, then, in corresponding order with the list above you will see the quotes that: