The LaTeX language is described in the book LaTeX - A Document
Preparation System.  LaTeX is a TeX macro package, not a modification
to the TeX source program, so all the capabilities described in tex(1)
are present.

The LaTeX macros encourage writers to think about the content of their
documents, rather than the form.  The ideal, very difficult to
realize, is to have no formatting commands (like ``switch to italic''
or ``skip 2 picas'') in the document at all; instead, everything is
done by specific markup instructions: ``emphasize'', ``start a
section''.

The slitex program is a variant of latex, designed for generating
slides.  It is described in Appendix A of LaTeX - A Document
Preparation System.
