The manual pays special attention to the use of information technologies in the commercial activities of small, medium and large businesses. It reflects the latest achievements in the field of information technology in relation to commercial activities: service-oriented architecture of information support for enterprises, Web services, the use of intelligent data processing methods and forecasting of enterprises' activities based on them, Web 2.0 technologies, etc. The use of integrated corporate information systems, such as "Galaxy," "SAP NetWeaver" "Microsoft Dynamics AX," etc. for the management of trading enterprises is considered.