> I'm tex user. I want to know how to wirte latex class > and style file. http://www.tex.ac.uk/cgi-bin/texfaq2html?label=writecls there are no guides, really, beyond what that outlines, other than the language the things are usually written in, for which see http://www.tex.ac.uk/cgi-bin/texfaq2html?label=dtx