The basic Open Graph object requires og:title, og:type, og:image, and og:url. A short og:description is usually useful to the reader, but it belongs to the additional fields. The values should describe the specific announcement page, not a general template for the whole site.
Minimal example of your own
Suppose you have a meeting page https://example.com/meeting/ and an image https://example.com/images/meeting.png. For it, you can specify og:title with the value "Authors' meeting on Saturday", og:type — website, og:url — the page address, og:image — the full address of the file. In og:description, briefly explain the topic and the next step.
Each value goes into a meta tag with the property and content attributes inside head. For example: <meta property="og:type" content="website">. On a live site, escape quotation marks and other special characters in the values, and replace the domain example.com with your own. The basic and additional properties are described in the Open Graph specification.
Checking the publication
Place the metadata in the source HTML. Open the page without authorization and run the preview check. The expected values should appear in the table. The text layout selects the title by priority: og:title, then twitter:title, then the regular title; the presence of one does not prove the presence of the others.
Check og:url and the final URL after redirects. The image address must not have a private token or a short expiration time. Open the file separately: the tool shows its address, but does not evaluate the composition and readability.
What will remain outside the markup
Do not promise exact display of the card in all apps. They may crop the image, change the number of lines, or use a saved version. Send the link somewhere the audience will see it, and look at the actual result on a phone.
Open Graph helps describe a page for link sharing. It does not replace the useful text of the page and does not guarantee a position in Google, Yandex, or a language model's answer. After changing the content, keep the metadata consistent with it, so that the card title does not promise something that is no longer on the page.
If a separate public announcement in Telegram has been prepared for this work, you can check the current view terms. Checking metadata is free; a separate order of views does not change the card or the apps' cache. Purchased activity does not confirm organic interest, recommendations, leads, or sales.