The following code
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.fractals}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}[scale=3,decoration=Koch snowflake]
\draw decorate{ (0,0) -- (3,0) };
\draw decorate{ decorate{ (0,-1) -- (3,-1) }};
\draw decorate{ decorate{ decorate{ (0,-2) -- (3,-2) }}};
\draw decorate{ decorate{ decorate{ decorate{ (0,-3) -- (3,-3) }}}};
\end{tikzpicture}
\end{document}
Gives me the following picture:

To emphasize the initiator and I'd like the first figure to be a straight line, like on this picture:

(source: vanderbilt.edu)
The problem is that I don't quite understand what the numbers { (0,0) -- (3,0) } mean, and being new to TeX, I also don't know where to look it up.
\draw (0,1) -- (3,1);? – Sigur Jul 28 '14 at 22:54[decoration=Koch snowflake]is about and I couldn't find anything except examples. – Leo Jul 30 '14 at 21:03