If you include a link within a Mastodon post, it will automatically show a "link preview" below the post.

Link previews often show an image associated with the link and/or basic information about the contents of the link.

You don't have to do anything special, the preview is generated automatically. It may sometimes take a few minutes to appear if your server is busy.

More info about previews as well as many questions answered at:

➡️ fedi.tips/how-do-i-get-a-link-

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If you have a fediverse account, you can quote this note from your own instance. Search https://social.growyourown.services/users/FediTips/statuses/115991316242209184 on your instance and quote it. (Note that quoting is not supported in Mastodon.)