When you post a link to your portfolio on social media, the respective social network will automatically display a preview of the link, usually consisting of a title and an image. Here is a link preview example from X/Twitter:

Also, when Google indexes your portfolio (which will automatically happen with your Authory portfolio), it will display the title and a description. Example:

By default, Authory will create a collage of the images of your most recent three content items and show that as the preview picture for social media. However, you can change that anytime. You can also change the title and description that will be displayed, both on social networks and on Google.

Here is how:

Go to your portfolio section and click "Settings" in the top bar:

Select "SEO & Social Media" from the menu that opens. In the screen that follows you'll be able to customize both image and text: