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Preamble. The preamble to a LaTeX document is all the information that occurs before the document begins. The preamble starts with the command \documentclass{} and ends with the command \begin{document}.

The \author{..} and \date{..} commands are used to display information regarding the document author's name and the date of the document. Both commands can be updated by changing the information within the curly brackets. To include today's date in the document, use the command \today .

Usually the second line in the author tag is for the author's address and affiliation which may include the email address. Sometimes, the email address is rather put into a footnote (e.g. with the \thanks{} tag inside the \author{} tag).

If you want to put a specific date then type it in the argument to \date{...}. If you do not want a date then type \date{} with the argument empty. \documentclass: This is always the first line (command) in any LaTeX file. It has one mandatory argument (in braces) and a place for optional arguments (square brackets).

\def allows you to define new macros. The command must begin with an escape character (category code 0) and be composed of a series of letters (category code 11) or one single non-letter, following the escape character. (

The \author command declares the author(s), where names is a list of authors separated by \and commands. Use \\ to separate lines within a single author's entry -- for example, to give the author's institution or address. NOTE: The milstd and book-form styles have re-defined the \maketitle command.

The \\ command tells LaTeX to start a new line. It has an optional argument, extra-space , that specifies how much extra vertical space is to be inserted before the next line. This can be a negative amount.