Add a Facebook Thumbnail Image – WordPress tricks
When you share a link on Facebook, next to the title, description there is also image. You can set this picture in the post:
1 – as a featured image
2 – if you use Yoast SEO – in second tab, you can find additional fields where you can add the title, description, and image for Facebook
When you save these changes, don’t forget to run Facebook Debugger.