Increase counter value upon button click

I cannot seem to get the jQuery bit I need to work. I've never used jQuery before, but I'd like to have a button on my page that, when clicked, increments an initially 0 value by one. My question is similar to https://stackoverflow.com/questions/4701349/jquery-increase-the-value-of-a-counter-when-a-button-is-clicked and https://stackoverflow.com/questions/15576769/press-button-and-value-increases-in-text-box but I can't make sense of what I'm doing wrong. Here's what I have: Any help is greatly appreciated. Please forgive any huge glaring mistakes, I have no idea how to do any of this yet. Thank you, and happy tidings! =)
where are the elements update and counter? and why do you have jquery two times included?

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