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Why don't load jQuery files in the footer of the site as what assumed to be the best practice?
In the video you put jQuery files link in the head section in order to make sure that it appears before bootstrap.min.js
From what I read from stackoverflow, you load jQuery at the top because there might be plugins that add inline jQuery code at the head. I would assume a plugin that adds Google tracking code to the beginning of the head would be one case, but not sure if that uses jQuery.