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The issue is not with "Wordpress structure", but because you're loading the script in<head>, but attempting to access elements in the document body before waiting for the DOM to be ready.
<script> tags in the<head> will be downloaded and executed, before the browser parses the rest of the HTML found after<head> This causes issues with your selectors since when the script is executed, those elements that would have matched your selectors do not exist in the DOM tree at runtime:
Source: https://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html
There are two solutions:
script.js is loaded in the footer, which means the DOM has been parsed and is ready, orscript.js in a callback that is invoked upon the firing ofDOMContentLoaded event:window.addEventListener('DOMContentLoaded', () => {
const nextBtns = document.querySelectorAll(".btn-next");
console.log("nextBtns",nextBtns)
});
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