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Next: Errors
Up: LATEX Concepts
Previous: Environments and commands
At the top of your file you will have a line something like
\documentclass[12pt]{article}
which determines the font size and document
class - the type of document you're writing.
Each class has an associated *.cls file in the system directories
which is read in at
start-up time.
Other options accepted
by article include 10pt, 11pt and
twocolumn.
Then you'll probably need to load in extra macros with the
\usepackage command. Each package has an associated
*.sty file in the system directories. The packages
inherit the options from the \documentclass line and can be
given others of their own. E.g.
\usepackage[dvips]{graphicx}
\usepackage[dvips]{color}
tells LATEX that you want to use the extra graphicx and
color macros, and that you are going to use dvips
to convert the resulting file to postscript. You can shorten this to
\usepackage[dvips]{graphicx,color}
