Hello,
1. Please try to add this code in Theme Options > Styling > Custom css:
.single-product .product-information .product_meta {
display: none;
}
Please read this article https://docs.woocommerce.com/document/editing-product-data-tabs/
-description header
(not the entire tab, just the header to disappear, so the contents on description section to appear right below the product images)
– please provide screenshot for better understanding and link to your site.
2. Please read this topic https://www.8theme.com/topic/change-words/
3. There is no such setting, but you may change it in file http://prntscr.com/h7re8u
xstore/woocomerce/single-product/related.php. We recommend making changes in the child theme https://codex.wordpress.org/Child_Themes because you’ll lose all modifications after each theme update.
Regards