I tried to use jQuery in a template (app\code\Black\Newsletter2Go\view\frontend\templates\account\dashboard\info.phtml) but I get jQuery is not defined.
Does Magento 2 not use jQuery?
Do I have to add:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
to the head template?