I was also a bit surprised by the simplicity of course 1, but then remembered that the course as a whole is designed for folks with no experience. Looking through the descriptions for the other courses (the actual material isn't out yet) I'm hopeful they will have the level of depth I think we're all expecting.
Yeah you definitely want to keep in mind that this cert, and especially Course 1, has to be accessible to anyone. So it's building a foundation of common knowledge for the other courses which absolutely go into much more details.