Sales is where your company earns. It holds your customers and everything that flows from them: the orders they place, the waybills that send goods out of your warehouse, the invoices that turn deliveries into money owed, the receipts that record money actually received, and the credit notes that put a sale right when something goes wrong.
Used well, Sales answers the questions a trading business asks every day. Who owes us money, and how late are they? What have we promised to deliver, and what is still outstanding? Which customers are near their credit limit? What did we sell this month, to whom, and at what margin? The module's documents are also promises with a paper trail: an approved order is a commitment the rest of the business plans around — the warehouse reserves its work, the books count the exposure, and the invoice that eventually follows is held to the order's prices.
Sales does not work alone. It sells what Products defines and what Inventory holds; its invoices become receivables in Accounts; its receipts land in your bank accounts there. This chapter follows the selling path end to end, in both of its depths — the full order-to-invoice chain of [Standard], and the shorter direct path of [Simple] (see 0.5).