To display a custom profile card start with this and fill in the details: [shortcode name="my name" url="a picture of your lovely face"]a short description[/shortcode] You should get something that looks like this:
Resources I learned from:
https://developer.wordpress.org/plugins/intro/
https://kinsta.com/blog/wordpress-shortcodes/
https://torquemag.io/2017/06/custom-shortcode/
https://pagely.com/blog/creating-custom-shortcodes/
https://www.tbare.com/2018/10/create-a-simple-wordpress-plugin/