Hi fedor2626,
Thanks for reaching to us.
There are 3 default tabs of WooCommerce:
+ The Additional Information Tab: Shows when the Attributes are added under a Product. If the Attributes are not added then the Additional Information tab doesn’t show.
+ Description Tab: This is the main description on the product page. Please enter the product and make sure you have added the content.
+ Reviews: Used to show customers’s reviews.
Regards,