What are the "Active tickets" and "Waiting first reply" tabs on the dashboard?

"Active tickets" lists your most recent open tickets, and "Waiting first reply" lists tickets that have not received any reply yet. Each tab shows its ticket count in parentheses, and every row shows the ticket number, subject, a message preview, the requester, its priority, when the last message arrived, and the assignee (or an Unassigned tag).