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David Diehr16,457 Points
When and where to add script tags and jquery?
If I'm making a site with multiple pages, do I need to include script tags on every page (or on all the pages js used) or just the index page?
It depends, if you are only using the jQuery library and some associated jQuery code on a single page of your entire website, it would be unnecessary to load it on every single page, however, if you are using jQuery throughout the entire site most people generally load this within a footer file so that it is loaded just before the closing body tag on all pages of the website.
Henrik Hansen23,176 Points
You must load the script wherever it is used. Most ppl have catching enabled in the browser, so if you load the same files all over your site the performance will not be affected that much even with large files, and the jQuery is almost always already in cache as it is commonly used. I recommend loading all files in the head tag, and then an executing line of code in the end of the document, or wherever you need the execution to be made. There are events you can use as well, such as the onload event.
Read more at W3schools DOM events