Statistics and reports are an integral part of any business. It gives you a quick overview of how your business is performing on a timeline.
The dashboard provides a quick overview of reports for a time period set in the settings. You do not want to show all the reports to the dashboard. You can set which reports should be there in the reports settings.
As the name suggests, it shows reports about the number of tickets that arrived for the given duration.
First response time means the time taken by an agent to respond to a ticket for the first time after its arrival. This is an important report for you to understand how your agents are performing and how much average time customers getting the first response from your end.
Categories or any custom field which has options will have a separate report section. These reports are shown in horizontal bars so that it gets fit to whichever screen you are seeing it.