With Opencart at the bottom of the product page, under the description, Tags related to this product can be added:
The admin panel has a field for manually adding tags:
The plugin allows you to fill in this field automatically, in bulk for all products. The field is filled in when adding or updating a product.
To update or add tags to a product, you must enable the button in the supplier form settings this way:
If you stop at this step, tags containing only the product category and the manufacturer will be added to the products:
Additionally, some product attributes can be added to tags (when adding or updating attributes):
Enable attribute update in supplier form, in "General Buttons":