Javascript "uncaught error $ is not defined"

 <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>

https://www.tutorialrepublic.com/faq/how-to-fix-dollar-is-not-defined-error-in-jquery.php

The most common reason behind the error "Uncaught ReferenceError: $ is not defined" is executing the jQuery code before the jQuery library file has loaded.