I want to remove jquery.min.js. because I don't need it. For this, it is necessary not to use "wp_deregister_script".

I also added the theme's js file manually.

<script type='text/javascript' src='http://site/wp-content/themes/mytema/js/scripts.js'></script>

but the js file of the theme does not work when I add it manually. When I checked with Chrome, I saw the following error.

Uncaught ReferenceError: jQuery is not defined https://sitet/wp-content/themes/mytema/js/scripts.js:1

There is no need for a reference. There is only one js file now. How can I fix this problem? thanks.