Record a sale with the products and quantities, and you get an invoice for your customer and a sales record, all at once.
Every sale feeds your reports, so you can see which products really sell, alongside your stock and expenses.
Yes. You can download an invoice for any sale, not just a receipt.
Yes. Your reports show your best and slowest-selling products, worked out from the sales you record.
Yes. Your stock is tracked alongside your sales, so you see both in one place.