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Every tutorial I come across says to make sure you call jQuery in the header:
<script language="javascript" src="http://code.jquery.com/jquery-1.7.min.js"></script>
Even if you only want to use it on one page. Why would you want jQuery to sit in your header and load on every page of your website if you only want to use it on one?
I’m a noob so just asking.
The primary reason is to guarantee that any javascript function that might fire up on your document before is fully loaded and that are dependent on jQuery, can execute without problems.
If you are sure this is not the case with your page, you can perfectly include jQuery at the bottom of the page. In fact, it may improve load time of the page, and this applies to any javascript library.