To make a course stand out on the Moodle home page, it is possible to upload an image for the course thumbnail. When viewing the Moodle Dashboard in the card or summary view, the image will be shown. If you don't set an image, Moodle picks a default abstract image. Learn more about the course overview listing on our Moodle Dashboard help page.
The first course has a custom course image. The other courses have a default Moodle image.
"Liminal Thinking" image from Dave Grey, The roots of Liminal Thinking
Go to your course and click the Settings link below the course title.
Go to the Description section and upload your image to the Course image section.
Save the updated setting and go to your course listing to see the results