add-cart-to-wordpress-menu.php

<?php

add_filter( 'wp_nav_menu_items', 'your_custom_menu_item', 10, 2 );
function your_custom_menu_item ( $items, $args ) {
    global $woocommerce;
    $cart_url = $woocommerce->cart->get_cart_url();
    $cart_count = sprintf(_n('%d', '%d', $woocommerce->cart->cart_contents_count, 'woothemes'), $woocommerce->cart->cart_contents_count);
    $cart_total = $woocommerce->cart->get_cart_total();
    
    if ($args->theme_location == 'primary') {
        $items .= "<li><i class='fa fa-shopping-cart'></i><a class='cart-contents' href='$cart_url'> $cart_total - $cart_count</a></li>";
    }
    return $items;
}

?>

add-custom-brand-by-link.php

<?php 
add_action('woocommerce_single_product_summary', 'hjs_add_brand_by_link', 5);
function hjs_add_brand_by_link() { 
    global $post;
    $post_id = $post->ID;
    $terms = get_the_terms($post_id, 'product_brand' );
    foreach ($terms as $term) { ?> 
        <span class="brand-by-link">by <a href="<?php echo get_term_link( $term,  'product_brand' ); ?>"><?php echo $term->name; ?></a></span>
    <?php }
} 
?>

better-sidebar-widget-display-of-woocommerce-categories.php

<?php
function hjs_woocommerce_categories() {

    $taxonomy     = 'product_cat';
    $orderby      = 'name';  
    $show_count   = 1;      // 1 for yes, 0 for no
    $pad_counts   = 1;      // 1 for yes, 0 for no
    $hierarchical = 1;      // 1 for yes, 0 for no  
    $title        = '';  
    $empty        = 0;
    
    $args = array(
        'taxonomy'     => $taxonomy,
        'orderby'      => $orderby,
        'show_count'   => $show_count,
        'pad_counts'   => $pad_counts,
        'hierarchical' => $hierarchical,
        'title_li'     => $title,
        'hide_empty'   => $empty
    ); ?>
    
    <?php $all_categories = get_categories( $args );
    //print_rr($all_categories);
    ?>
    <ul>
    <?php
    foreach ($all_categories as $cat) {
        //print_rr($cat);
        if($cat->category_parent == 0) {
            $category_id = $cat->term_id; ?>

    <li><a href="<?php echo get_term_link($cat->slug, 'product_cat'); ?>"><?php echo $cat->name; ?></a> <span class="product-items"> - <?php echo $cat->count; ?> Items</span></li>

    <?php
    /* $args2 = array(
      'taxonomy'     => $taxonomy,
      'child_of'     => 0,
      'parent'       => $category_id,
      'orderby'      => $orderby,
      'show_count'   => $show_count,
      'pad_counts'   => $pad_counts,
      'hierarchical' => $hierarchical,
      'title_li'     => $title,
      'hide_empty'   => $empty
    );
    $sub_cats = get_categories( $args2 );
    if($sub_cats) {
        foreach($sub_cats as $sub_category) {
            echo  $sub_category->name ;
        }

    } */ ?>
    
<?php }     
    } ?>
    </ul>
<?php }
?>

change-number-of-related-products.php

<?php 
function woo_related_products_limit() {
  global $product;
    
    $args['posts_per_page'] = 3;
    return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'jk_related_products_args' );
  function jk_related_products_args( $args ) {

    $args['posts_per_page'] = 3; // 4 related products
    $args['columns'] = 3; // arranged in 2 columns
    return $args;
}
?>

custom-sidebar-shopping-cart.php

<?php 

function custom_sidebar_shopping_cart() {

    global $woocommerce;
    
    $cart_total = $woocommerce->cart->get_cart_total();
    $cart_url = $woocommerce->cart->get_cart_url(); 
    
    //print_rr($cart_total);
    //var_dump($cart_total);
    
    if ( sizeof( $woocommerce->cart->cart_contents ) == 0 )  { ?>
        <div class="cart-contents empty">
            <div class="cart-wrap">
                <i class="fa fa-shopping-cart"></i>
                <span class="no-items">You don't have anything in your cart yet.</span>
            </div>
            <div class="shop-button-wrap">
                <a class="shop-button" href="<?php echo home_url(); ?>/shop" title="<?php _e('View your shopping cart', 'woothemes'); ?>"> Keep Shopping  <i class="fa fa-arrow-circle-right"></i></a>        
            </div>
        </div>
    <?php } else { ?>
        <div class="cart-contents">
            <div class="cart-wrap">
                <span class="left-side">
                    <i class="fa fa-shopping-cart"></i>
                    <?php echo sprintf(_n('%d item', '%d items', $woocommerce->cart->cart_contents_count, 'woothemes'), $woocommerce->cart->cart_contents_count); ?>
                </span>
                <span class="right-side"><?php echo $cart_total; ?></span>
            </div>
            <div class="shop-button-wrap">
                <a class="shop-button checkout" href="<?php echo $cart_url; ?>" title="<?php _e('View your shopping cart', 'woothemes'); ?>"> Checkout <i class="fa fa-arrow-circle-right"></i></a>        
            </div>
        </div>
    <?php }
        
}

hjs-custom-featured-products-in-sidebar.php

<?php 
function hjs_better_featured_product_widget() {
     $args = array( 'post_type' => 'product', 'meta_key' => '_featured', 'meta_value' => 'yes', 'posts_per_page' => 2, 'orderby' => 'rand' );
     $loop = new WP_Query( $args );
     while ( $loop->have_posts() ) : $loop->the_post(); global $product; ?>
        <div class="featured-product-widget"> 
            <a href="<?php echo get_permalink( $loop->post->ID ) ?>" title="<?php echo esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID); ?>">
            <?php if (has_post_thumbnail( $loop->post->ID )) echo get_the_post_thumbnail($loop->post->ID, 'full'); ?>
            <h3><?php the_title(); ?></h3>
            <span class="price"><?php echo $product->get_price_html(); ?></span>
            <?php woocommerce_show_product_sale_flash( $post, $product ); ?>
            <?php echo apply_filters( 'woocommerce_short_description', $post->post_excerpt ); ?>
            <a class="shop-button checkout featured" href="<?php the_permalink(); ?>">View Product <i class="fa fa-arrow-circle-right"></i></a>
        </div>
     <?php endwhile; ?>
     <?php wp_reset_query(); ?>
<?php }