How to add reviews to WooCommerce
The short answer
Build a widget, copy one line of code, and paste it into a Custom HTML block. the WordPress block editor on a product or shop page. No developer and no theme files.
Step by step
Build the widget and connect your review sources
Choose a layout and match the colours to your site
Copy the embed code
In WooCommerce: the WordPress block editor on a product or shop page
Add a Custom HTML block and paste the code
Save and check the live page
Where to put them
In the product description tab, under the add-to-cart area, or on the shop landing page. Shortcodes work if your theme supports them in product tabs.
Full-width sections suit carousel and grid layouts; narrow columns suit a badge.
Does WooCommerce have reviews built in?
WooCommerce has product reviews built in and they are perfectly good for reviews left on your own store. What they cannot show is a review someone left on Google, Amazon or Etsy.
If your reviews already live on Google or a marketplace, nothing built into a site builder will reach them.
If they do not appear
Product page templates vary a lot between WooCommerce themes, so a block added to one template may not appear on another.
The WooCommerce troubleshooting page works through the rest in order.