Clients Carousel in WordPress using Custom Post Types, Advanced Custom Fields and Flexslider.

functions.php

// Register Custom Post Type
function partner() {

	$labels = array(
		'name'                  => _x( 'partner', 'Post Type General Name', 'partner' ),
		'singular_name'         => _x( 'partner', 'Post Type Singular Name', 'partner' ),
		'menu_name'             => __( 'Partner', 'partner' ),
		'name_admin_bar'        => __( 'Partners', 'partner' ),
		'archives'              => __( 'Item Archives', 'partner' ),
		'attributes'            => __( 'Item Attributes', 'partner' ),
		'parent_item_colon'     => __( 'Parent Item :', 'partner' ),
		'all_items'             => __( 'All Partners', 'partner' ),
		'add_new_item'          => __( 'Add New Item of partner', 'partner' ),
		'add_new'               => __( 'Add New Partner', 'partner' ),
		'new_item'              => __( 'New Item partner', 'partner' ),
		'edit_item'             => __( 'Edit partner', 'partner' ),
		'update_item'           => __( 'Update partner', 'partner' ),
		'view_item'             => __( 'View Item partner', 'partner' ),
		'view_items'            => __( 'View Items of partners', 'partner' ),
		'search_items'          => __( 'Search Item partner', 'partner' ),
		'not_found'             => __( 'Quote Not found', 'partner' ),
		'not_found_in_trash'    => __( 'Quote Not found in Trash', 'partner' ),
		'featured_image'        => __( 'Partner Featured Image', 'partner' ),
		'set_featured_image'    => __( 'Set featured image of partner', 'partner' ),
		'remove_featured_image' => __( 'Remove featured image of partner', 'partner' ),
		'use_featured_image'    => __( 'Use as featured image for partner', 'partner' ),
		'insert_into_item'      => __( 'Insert into item', 'partner' ),
		'uploaded_to_this_item' => __( 'Uploaded to this item', 'partner' ),
		'items_list'            => __( 'Items list', 'partner' ),
		'items_list_navigation' => __( 'Items list navigation', 'partner' ),
		'filter_items_list'     => __( 'Filter items list', 'partner' ),
	);
	$args = array(
		'label'                 => __( 'partner', 'partner' ),
		'description'           => __( 'Post Type Description', 'partner' ),
		'labels'                => $labels,
		'supports'              => array( 'title', 'custom-fields', ),
		//'taxonomies'            => array( 'category', 'post_tag' ),
		'menu_icon'				=> 'dashicons-format-status',
		'hierarchical'          => false,
		'public'                => true,
		'show_ui'               => true,
		'show_in_menu'          => true,
		'menu_position'         => 5,
		'show_in_admin_bar'     => true,
		'show_in_nav_menus'     => true,
		'can_export'            => true,
		'has_archive'           => true,
		'exclude_from_search'   => false,
		'publicly_queryable'    => true,
		'capability_type'       => 'page',
	);
	register_post_type( 'partner', $args );

}
add_action( 'init', 'partner', 0 );

//* Enqueue FlexSlider's CSS and Javascript 
// load from js and CSS folders
add_action( 'wp_enqueue_scripts', 'enqueue_flexslider' );
function enqueue_flexslider() {
     wp_enqueue_script ('jQuery.vbaimas', get_template_directory_uri() . '/js/jQuery.vbaimas.js', array('jquery'));
     wp_enqueue_script ('jquery.flexslider-min', get_template_directory_uri() . '/js/jquery.flexslider-min.js', array( 'jquery' ));
     wp_enqueue_style( 'slick-styles', get_template_directory_uri() . '/css/flexslider.css' );
}

index.php

<section class="partners">
    <div class="row">
       <h2 class="align-center"> Some companies which have placed their <span class="w700">trust in us</span></h2>
          <div class="sm-12 md-12 lg-6 lg-offset-3 columns">
              <p class="align-center">Our fitted offices are suitable for different types of businesses which also create a platform for networking and collaborations.</p>
          </div>
    </div>

    <div class="row">
        <?php
          $args = array(
          'post_type' => 'partner',
          'post_status' => 'publish',
           );
           $partner_query = new WP_Query( $args );?>
            <?php if($partner_query->have_posts()) : while($partner_query->have_posts()) : $partner_query->the_post(); ?>
            <?php $images = get_field('add_new_partner');
            if( $images ): ?>
                <div class="sm-12 md-12 lg-12 columns">
                    <div class="flexslider clearfix">
                        <ul class="slides">
                            <?php foreach( $images as $image ): ?>
                                <li>
                                    <img class="partner" src="<?php echo $image['sizes']['partner']; ?>" alt="<?php echo $image['alt']; ?>"/>
                                </li>
                                <?php endforeach; ?>
                        </ul>
                    </div>
                </div>
            <?php endif; ?>
           <?php endwhile; endif;?>
           <?php wp_reset_postdata();?>
    </div>
    
    <div class="row">
       <a class="more-p align-center" href="<?php echo get_page_link(11); ?>">Partner with us</a>
    </div>
</section>

jQuery.vbaimas.js

jQuery(document).ready(function($) {
  $('.flexslider').flexslider({
    animation: "slide",
    animationLoop: false,
    itemWidth: 210,
    itemMargin: 5,
    directionNav : false,
  });
});