Hi @devann,
Thanks a lot for your comment. You are totally right to point this out. People often don't realise that in order to use pictures, we have to have the according license rights. It's possible to get free images from websites like https://pixabay.com and as you said sometimes a link to the source is required. But even if it is not requested by the license, I think it's good practise to give the source. The same goes for screen captures.

Best regards,
Achim