Ability to add photos in web dev learning

I am currently taking the HTML+CSS course to learn about website development and I would like to do the projects but much of it wants you to add images and from I have found you cant add any images from outside KA site. This is kind of constricting considering it is supposed to be teaching us how to do these things on our own when we start to create websites of our own. 

Has anyone else had these reservations/thoughts?