This is a really fantastic tool for learning how to read and use WordPress themes. The code is heavily commented and easily explains what does what.

<?php wphead(); // This fxn allows plugins, and WordPress itself, to insert themselves/scripts/css/files // (right here) into the head of your website. // Removing this fxn call will disable all kinds of plugins and WordPress default insertions. // Move it if you like, but I would keep it around. ?>

Great tool.