What to do with these recommendations from the Google Console?

Question

Google

Hello! I received the following email from Google Search Console:

"There are (6) issues found in the Products category on your site.

General Warnings

Warnings are a reason to think about optimizing your site. Some warnings let you know how to improve the appearance of pages in Google search results. which is a warning today may be classified as an error in the future Based on an analysis of your site, the following warnings were issued:

Missing "priceValidUntil"

field Missing "review" field Missing

global product identifier such as GTIN, MPN or ISBN

Missing "sku" field "

Missing field "url"

We recommend that you eliminate the above problems as far as possible. Then more pages of your site will appear in Google search results, and in the best possible way. "

Shop website on openCart 2.3, a store with electronics and accessories.
Which of Google's recommendations should be taken seriously? The fact is that, for example, ISBN is the same code for printed materials, MPN and GTIN where to get it? The field in openCart is only for MPN, but Where can I actually get this code? If the product, for example, is a smartphone, then it is on the package. But, for example, some kind of trinket with which generally came by mail in a transparent dress without any packs? Where are the codes?
sku is also a code from the package?
Field "priceValidUntil" - the price is valid until - there is no such field in openCart where to drive it?
Missing "url" field - do you mean seo url ?
the review field is what in general (in relation to opencart)?

Answer 1

recommendations are better to follow if the site is white