I will give you some examples, but you must be aware that Key Performance Indicators (KPIs) should be aligned with the strategic orientation of an organization. A fast fashion retail organization may have some KPIs very different from those applicable to a luxury retail organization. And even about those that are common, they may be followed with a different set of priorities and mindset.
Gross profit, sales and cost of goods sold are the basic three
You can have average sales per purchase, sales per square foot, sales per visitors
You can have inventory to sales, return rate, backorder rate