Now you want to know what this is good for. Read on:
TeX is a document programming system (though most people call it a typesetting system).
You program your document the way you want it to look like (and the contents, of course), in TeX
language.
The *.dvi output from TeX is 1:1 translatable to PostScript and bigger, more expensive typesetting
systems.
The good thing is that TeX output looks alike, no matter what printer or fotographic
typesetting system you use.
The bad thing is that you need to learn how to write a program. See programming.
% A percent sign marks a comment input style.tex % takes style tex and processes % it as if it had been copied \hrule % horizontal line \"a \"o \"u \ss \"A \"O \"U % German umlauts \"a\ \"o\ \"u\ \ss\ % small German umlauts, % separated by spaces. % an empty line marks the end of a paragraph \cmr10 % switches to font % Computer_Modern_Roman_10Pt. Default font. \it{This text appears in italic Style} % it does. \tt{Typewriter style} % oh yes \sf{SansSerif Font} % currently not available on this system \end % ends file