Upon entering TeX mode, either
There are two LaTeX menus to choose from, one short and the other long. You get a short menu by default. To install the long menu, simply choose the checkable menu item Short LaTeX Menu from the LaTeX Utilities submenu (see section 2.1.1) to remove the check mark. To reinstall the short menu, choose Short LaTeX Menu again.
The LaTeX menu follows closely the organization and terminology of Lamport's LaTeX: A Document Preparation System [second edition, Addison-Wesley, 1994], especially chapter 3. Many people agree that the LaTeX book is still the definitive LaTeX reference. In conjunction with The LaTeX Companion by Goossens, Mittlebach, and Samarin [Addison-Wesley, 1994 (ISBN 0-201-54199-8)], these two books constitute the ``official'' LaTeX2e documentation. These books, as well as Knuth's classic TeX book [Addison-Wesley, 1986 (ISBN 0-201-13448-9)], should be on every serious LaTeX user's desk.
The LaTeX menu is organized into four parts: general commands, document-related commands, paragraph mode commands (that is, text commands), and math mode commands. Each group of commands is separated by a thin grey line on the LaTeX menu. The order of the commands on any given submenu is significant insofar as possible. For example, the various commands on the Environments submenu mirror the corresponding command keys, while other submenus follow the ordering found in the LaTeX book. We'll try to point out these organizational aids as we go along.
A brief description of each available command follows. See section 1.2 for pointers to other help documents.