Use the Item Details report and filter by date or employee to view item sales. This report also has a search bar where you can find sales for specific items only (like "gift cards"). Use the All Hours drop-down if you want to look at item sales during a specific shift or period of time.
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Learn more: Menu Reports Overview.

Use the Sales Summary report to track the number of guests served (How do I see number of guests per server in a certain time period?)