This document discusses key SAP SD (Sales and Distribution) tables organized into the following categories: Customers, Sales Documents, SD Delivery Documents, Billing Document, SD Shipping Unit, and Configuration Tables. The Customers category includes tables like KNA1 for general customer data and KNB1 for customer master and payment details. The Sales Documents category includes tables like VBAK for sales document headers and VBKD for document business data. Configuration Tables includes things like T001 for company codes and TVKO for organizational units.