During installation, WooCommerce creates the Shop, Cart, Checkout and My Account pages automatically via the Setup Wizard. Sometimes users skip that part or maybe accidentally delete the pages after creation.
It is very easy to install them back. Follow below steps to re-create these key WooCommerce pages. (Please note that not having Shop, Cart, Checkout and My Account pages may result to unexpected behaviour).

1. Create all or the missing pages by going to Pages > Add New. Give them the title that you desire.
2. Enter the following shortcodes, to their respective pages. (While adding these shortcodes, use the default editor and not HostFiti Builder).
   [woocommerce_cart] – shows the cart page
   [woocommerce_checkout] – shows the checkout page
   [woocommerce_my_account] – shows the user account page
3. The shop page is specified by specifying it in WooCommerce Settings. To do so, go to your website’s dashboard, WooCommerce > Settings >Products Tab and proceed to the Shop Page section.
   

Once you are done adding the pages, you should tell WooCommerce what pages to use.

To tell WooCommerce what pages to use for Cart, Checkout, My Account, and Terms and Conditions, go to WooCommerce > Settings > Advanced.

More details about shorcodes can be found here.