@karstravels Regarding your first question, the ‘Facebook App ID’ that you have the option to input in Yoast SEO under Social>Facebook is a specific ID number assigned to your Facebook application (if you have one). You can find additional information on registering and configuring your Facebook application ID here: https://developers.facebook.com/docs/apps/register/#app-id.
If you have not specified a Facebook app ID for your site this does not interfere with the ability to share posts on Facebook, and if you don’t have a Facebook application you can just leave the ‘Facebook App ID’ field blank. We also have more information on this here: https://kb.yoast.com/kb/warning-fb-app-id-hasnt-been-included-in-the-meta-tags/
As for the page itself, we checked on the Open Graph metadata output on the page at https://karstravels.com/ and see the following:
<meta property="og:locale" content="en_US" />
<meta property="og:type" content="website" />
<meta property="og:title" content="Go on a road trip at least once in your life - KarsTravels" />
<meta property="og:description" content="KarsTravels is all about road trips, family travel, hotel reviews, where to eat, national parks and cultural experiences. Read about it on our blog." />
<meta property="og:url" content="https://karstravels.com/" />
<meta property="og:site_name" content="KarsTravels" />
<meta property="article:publisher" content="https://www.facebook.com/KarsTravels-199183207645665" />
<meta property="article:modified_time" content="2020-07-17T21:33:36+00:00" />
<meta property="og:image" content="https://karstravels.com/wp-content/uploads/2020/01/DSC_0297.jpg" />
<meta property="og:image:width" content="1920" />
<meta property="og:image:height" content="1080" />
We then confirmed that this data is loading as expected when we previewed the link in Facebooks Sharing Debugger here, so the issue does appeared to be resolved.