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The method for transferring values from JS to HTML tags in a Lightning Web Component is to use data binding.

Data binding is a way to establish a connection between the JavaScript code and the HTML code. This allows you to pass data or values from the JS controller to the HTML template, and vice versa.

To use data binding, you can use the curly bracket notation {{...}} to bind a property or value from the JS controller to an HTML tag. For example:

JS Controller:

import { LightningElement } from 'lwc';

export default class MyComponent extends LightningElement {
    myMessage = 'Hello World';
}

HTML Template:

<template>
    <h1>{myMessage}</h1>
</template>

In this example, the value of the myMessage property in the JS controller is passed to the h1 tag in the HTML template using data binding. This allows the text "Hello World" to be displayed in the header of the Lightning Web Component.