Why do we include jQuery in the header?

I was told not to mess with the core files. Also, I don’t want jQuery to load on every single page.

Get rid of the plugin/theme that’s causing jQuery to load 🙂 jQuery is shipped with WordPress doesn’t mean that it’s loaded every time by default, it’s being loaded by a theme or plugin that you’re using. Look for a call to wp_enqueue_script 🙂

Good luck!