How to create a link in Woocommerce to add a product to the cart?

Question

WooCommerce

Tell me please.
I have a Wordpress site with Woocommerce enabled. Only 1 item for sale.
I want to make it possible to put a button anywhere on the site, clicking on which will not open a page with a product, but immediately a shopping cart with goods added to it.
Perhaps somehow GET request can be done like /?add_cart&item=1

Answer 1

/?add-to-cart=123,
where 123 is the product id.

Answer 2

Here is the correct solution
http://supersait.ru/checkout/?add-to-cart=%ID% immediately to checkout
http://supersait.ru/cart/?add-to-cart=%ID% to the cart
Where %ID% = product id.