There are many functions available in WooCommerce that you can use to customize and enhance your online store. Here are some essential functions you should know.

1- Accessing functions using global $product object

Get product general info

global $product;

$product->get_type();
$product->get_name();
$product->get_slug();
$product->get_date_created();
$product->get_date_modified();
$product->get_status();
$product->get_featured();
$product->get_catalog_visibility();
$product->get_description();
$product->get_short_description();
$product->get_sku();
$product->get_menu_order();
$product->get_virtual();
get_permalink($product->get_id());

Get product prices

global $product;

$product->get_price();
$product->get_regular_price();
$product->get_sale_price();
$product->get_date_on_sale_from();
$product->get_date_on_sale_to();
$product->get_total_sales();

Get Product Tax, Shipping & Stock

global $product;

$product->get_tax_status();
$product->get_tax_class();
$product->get_manage_stock();
$product->get_stock_quantity();
$product->get_stock_status();
$product->get_backorders();
$product->get_sold_individually();
$product->get_purchase_note();
$product->get_shipping_class_id();

Get Product Dimensions

global $product;

$product->get_weight();
$product->get_length();
$product->get_width();
$product->get_height();
$product->get_dimensions();

Get Linked Products

global $product;

$product->get_upsell_ids();
$product->get_cross_sell_ids();
$product->get_parent_id();

Get Product Variations and Attributes

global $product;

$product->get_children(); // get variations
$product->get_attributes();
$product->get_default_attributes();
$product->get_attribute( 'attribute id here' ); //get specific attribute value

Get Product Taxonomies

global $product;

$product->get_categories();
$product->get_category_ids();
$product->get_tag_ids();

Get Product Downloads

global $product;

$product->get_downloads();
$product->get_download_expiry();
$product->get_downloadable();
$product->get_download_limit();

Get Product Images

global $product;

$product->get_image_id();
$product->get_image();
$product->get_gallery_image_ids();

Get Product Reviews

global $product;

$product->get_reviews_allowed();
$product->get_rating_counts();
$product->get_average_rating();
$product->get_review_count();

2- Accessing Core Functions

Product Functions

wc_get_product(): Get a product object by its ID.
wc_get_product_category_list(): Get the product's categories as a formatted string.
wc_get_product_tag_list(): Get the product's tags as a formatted string.
wc_product_gallery(): Display the product image gallery.
wc_get_product_reviews_rating_html(): Get the HTML for displaying the product reviews rating.

Cart Functions

WC()->cart->get_cart(): Get an array of products in the cart.
WC()->cart->add_to_cart(): Add a product to the cart.
WC()->cart->get_cart_contents_count(): Get the total number of items in the cart.
WC()->cart->get_cart_total(): Get the total cart amount. 

Checkout Functions

WC()->checkout->get_checkout_url(): Get the URL of the checkout page.
WC()->checkout->get_checkout_payment_url(): Get the URL of the payment page during the checkout process.
WC()->checkout->get_checkout_order_received_url(): Get the URL of the order received page after successful payment.

Order Functions

wc_create_order(): Create a new order programmatically.
wc_get_order(): Get an order object by its ID.
wc_get_orders(): Get an array of orders based on specific parameters.

User Account Functions

wc_get_customer_orders(): Get an array of customer orders.
wc_get_customer_average_spending(): Get the average spending of a customer.

Coupon Functions

wc_get_coupon_code() : Get the coupon code.
wc_get_coupon_amount() : Get the coupon amount.
wc_get_coupon_discount_type() : Get the coupon discount type.

General Functions

wc_price(): Format a price to the store's currency format.
wc_format_decimal(): Format a decimal number based on store settings.
wc_get_template_part(): Load WooCommerce template parts.
wc_enqueue_js(): Enqueue JavaScript scripts.
wc_enqueue_styles(): Enqueue stylesheets.