Hi bropoolslinda,
Thanks for reaching to us and appreciate your patience.
1. Product tabs
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.
+ Reviews: Used to show customers’ reviews.
About brand and Shipping delivery and other tab are custom tabs and can be edited via Theme Settings > Single product > Tabs: https://prnt.sc/bDOK7HP_6t7M
2. Quantities live update
You need to find a third-party plugin to achieve more functionality that best suits you.
Best Regards,
Hung PD