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Advanced Open Graph Tags
The Open Graph tags above are the ones you really need to know (og:description not so much, but it is useful). There are other, more advanced, tags you can use to provide even more in-depth specifications.

og:locale – defines the language, American English is the default
og:site_name – if the page (object) you are sharing is part of a larger network
og:audio or og:video – to add additional audio or video files to your object
fb:app_id – for linking to a Facebook application (e.g., FB Comments) with the object
Check Open Graph Tags

To make life easier, Facebook has created a tool called Open Graph Object Debugger (URL Linter). It has two very helpful functionalities.

First, when you type in the link you want to check, it returns any errors and suggestions for OG tags, if there are any. You also can check what the og:image looks like, what your description is, and so on.

Second, it clears the Facebook cache. Imagine this: you post a link to Facebook, but then you see a mistake in the thumbnail, so you go back to your site and adjust the OG tags, and you post it again on Facebook.

Probably, nothing will happen. The thumbnail will stay the same. This is because of the cache. The Facebook OG Debugger will refresh the cache on your links after any adjustments, so remember to use it each time.