I need to make my listing data searchable:

Specifically for Course Provider and Instructor. I haven’t used meta queries before, anyone know where I can start?

This is my current search form:

Form:

<form role="search" method="get" class="search-form" action="<?php echo esc_url( home_url( '/' ) ); ?>">
    <label>
        <span class="screen-reader-text"><?php esc_html_e( 'Search for:', 'listify' ); ?></span>
        <input type="search" class="search-field" placeholder="<?php esc_attr_e( 'Search', 'listify' ); ?>" value=""
        name="s" title="<?php echo esc_attr_e( 'Search for:', 'listify' ); ?>" />
    </label>
    <button type="submit" class="search-submit"></button>
</form>

Search Results:

if ( isset( $_GET['listings'] ) ) {
    return locate_template( array( 'archive-job_listing.php' ), true );
}

global $style;

$blog_style = get_theme_mod( 'content-blog-style', 'default' );
$style      = 'grid-standard' == $blog_style ? 'standard' : 'cover';
$sidebar    = 'none' != esc_attr( listify_theme_mod( 'content-sidebar-position', 'right' ) ) && is_active_sidebar( 'widget-area-sidebar-1' );

get_header(); ?>

<div <?php echo apply_filters( 'listify_cover', 'page-cover' ); ?>>
    <h1 class="page-title cover-wrapper"><?php printf( __( 'Search: %s', 'listify' ), get_search_query() ); ?></h1>
</div>

<div id="primary" class="container">
    <div class="row content-area">

        <?php if ( 'left' == esc_attr( listify_theme_mod( 'content-sidebar-position', 'right' ) ) ) : ?>
            <?php get_sidebar(); ?>
        <?php endif; ?>

        <main id="main" class="site-main col-12 
        <?php
        if ( $sidebar ) :
            ?>
             col-sm-7 col-md-8<?php endif; ?>" role="main">

            <?php if ( 'default' != $blog_style ) : ?>
            <div class="blog-archive blog-archive--grid 
                <?php
                if ( $sidebar ) :
                    ?>
                 blog-archive--has-sidebar<?php endif; ?>" data-columns>
                <?php add_filter( 'excerpt_length', 'listify_short_excerpt_length' ); ?>
            <?php endif; ?>

            <?php
            while ( have_posts() ) :
                the_post();

                if ( 'default' == $blog_style ) :
                    get_template_part( 'content' );
                else :
                    get_template_part( 'content', 'recent-posts' );
                endif;
            endwhile;
            ?>

            <?php if ( 'default' != $blog_style ) : ?>
                <?php remove_filter( 'excerpt_length', 'listify_short_excerpt_length' ); ?>
                </div>
            <?php endif; ?>

            <?php get_template_part( 'content', 'pagination' ); ?>

        </main>

        <?php if ( 'right' == esc_attr( get_theme_mod( 'content-sidebar-position', 'right' ) ) ) : ?>
            <?php get_sidebar(); ?>
        <?php endif; ?>

    </div>
</div>

Function:

global $listify_facetwp, $listify_widget_search_listings_instance;

// Make sure FacetWP Assets are loaded.
add_filter( 'facetwp_load_assets', '__return_true' );

// Get widget instance.
$instance = $listify_widget_search_listings_instance;

// Active facets for this widgets.
$facets_list = isset( $instance['facets'] ) ? array_map( 'trim', explode( ',', $instance['facets'] ) ) : listify_theme_mod( 'listing-archive-facetwp-home', array( 'keyword', 'location', 'category' ) );

// Load active facets datas.
$facets  = array();
$_facets = $listify_facetwp->get_homepage_facets( $facets );
if ( is_array( $_facets ) && $_facets ) {
    foreach ( $_facets as $_facet ) {
        if ( in_array( $_facet['name'], $facets_list ) ) {
            $facets[] = $_facet;
        }
    }
}
?>

<div class="job_search_form job_search_form--count-<?php echo absint( count( $facets ) ); ?>">
    <?php echo $listify_facetwp->template->output_facet_html( $facets ); // WPCS: XSS ok. ?>

    <div class="facetwp-submit">
        <input type="submit" value="<?php esc_attr_e( 'Search', 'listify' ); ?>" onclick="facetWpRedirect()" />
    </div>

    <div style="display: none;">
        <?php echo do_shortcode( '[facetwp template="listings"]' ); ?>
    </div>

</div>

<script>
function facetWpRedirect() {
    FWP.parse_facets();
    FWP.set_hash();
    window.location.href = '<?php echo listify_get_listings_page_url(); ?>?' + FWP.build_query_string();
}

(function( window, undefined ){
    var $ = window.jQuery;
    var document = window.document;

    $(document).on( 'keyup', '.facetwp-facet .facetwp-search', function(e) {
        if ( e.keyCode == '13' ) {
            facetWpRedirect();
        }
    } );
})( window );

Not sure if this is even the right information you need. Any help would be much appreciated!