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<?php

function jw_script_enqueue() {

wp_enqueue_style('custom-style', get_template_directory_uri() . '/css/jw-custom.css', array(), false, 'all' );
we_enqueue_script('custom-js', get_template_directory_uri() . '/js/jw-custom.js', false, true)

}

add_action( 'wp_enqueue_scripts', 'jw_script_enqueue');

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>JW Custom</title>
        <?php wp_head(); ?>
    </head>

    <body>

<footer>
            © 2018 JW Custom
        </footer>

        <?php wp_footer(); ?>
    </body>
</html>