You can change the headings and other text shown on catalog pages in Products > Settings > Front-end Labels:
The screen opens on Single Item Page, with the labels for the individual product page:
The labels that you can edit by default: Price Label, Free Product Text, After Price Text, Shipping Label, Free Shipping Text, SKU Label, MPN Label, Description Label, Features Label, Another Categories Label, Return to Products Label, and the Weight and Size labels (Size, Width, Length, Height). Extensions and the selected catalog mode can add more labels here.
Change any of the labels and save the changes. The new text shows on all product pages right away. If you leave a heading label empty, for example the Description Label, the heading is not shown.
Product Listing Labels
To edit the labels on product listing pages, switch to Listing Pages in the menu on the left:
The labels that you can edit by default: Main Listing Title Label, Categories Header Label, Subcategories Header Label, Category Prefix Label, Category Products Header Label, Next Page Label, Previous Page Label and Breadcrumbs Home Label. Extensions can add more labels here.
In the Subcategories Header and Category Products Header labels, [product_category_name] is replaced with the name of the current category.
On sites in English, some default labels use your catalog name. For example, if you set the Catalog Plural Name to ‘Flowers’ in General Settings, the default category heading becomes ‘[product_category_name] Flowers’. Labels that you have already changed and saved stay as they are.
Change labels in the Customizer
You can also change many of these labels in the WordPress Customizer, in the Product Catalog panel, and see the result in the live preview. See product page template for how to open the Customizer from a product page.