Using custom taxonomy to tag posts for inclusion in slider

Remember to wrap your strings in quotes. I think that’s the main issue. This works for me:

<?php
// https://developer.wordpress.org/reference/classes/wp_query/#taxonomy-parameters
// Set up a new WP_Query object for posts that have the 'homepage' term
// set for the 'slider' taxonomy:
$slide_query = new WP_Query( array(
    'posts_per_page' => 100, // Set a reasonable limit just in case.
    'post_type'      => 'post',
    'tax_query'  => array(
        array(
            'taxonomy' => 'slider', // Strings should have quotes!
            'field'    => 'slug',
            'terms'    => 'homepage',
        ),
    ),
));
?>

Then output the HTML:

<?php if ( $slide_query->have_posts() ) : ?>
    <div class="slider">
        <?php while ( $slide_query->have_posts() ) : $slide_query->the_post(); ?>
            <div class="slide">
                <h2 class="slide-title">><?php the_title(); ?></h2>
                <div class="slide-content">
                    <?php the_content(); ?>
                </div>
            </div>
        <?php endwhile; ?>
    </div>
<?php wp_reset_postdata(); ?>
<?php endif; ?>

You don’t need to do the $temp = $wp_query; $wp_query= null; thing. Just create a new variable like I did in the example, and call wp_reset_postdata() as I did in the example.

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