I need to display all post in onepage

You can use WP_Query

<?php 
    $args = array(
        "post_type'      => 'faq',
        'post_status'    => 'publish',
        'order'          => 'DESC',
        'orderby'        => 'date',
        'posts_per_page' => -1
    );

    $query = new WP_Query( $args );

if( $query->have_posts() ): ?>
    <ul id="myUL" class="margb-40">
    <?php while( $query->have_posts() ): $query->the_post(); ?>

        //content

    <?php
    endwhile; ?>
    </ul>
<?php
    wp_reset_postdata();
endif;