This Technical Report complements ISO 8879 by providing additional tutorial information, intended as an extension, modification, or interpretation of ISO 8879. The SGML language contains a number of components, some of which are optional features. The tutorial information covers the main components of the language only. Includes notes on the analysis of a document prior to the writing of a formal document type definition, and a series of examples. Covers references, definitions, letter and memorandum, spreadsheet, mathematics, tables, integration of computer graphics metafiles, Japanese, Scandinavian Runes, European Multi-lingual Document, the use of short references and mixing text in languages written from left to right and from right to left.