Seriously though, they are fun. Racket's way of programming with pictures is great. Maybe following the book at your own pace would be more rewarding.
The two intro courses that use htdp are not nearly as rigorous as the book, you never get to see anything difficult enough to warrant using the design recipes where the book you begin to appreciate that style more and more as it gets harder.
[1] https://www.edx.org/micromasters/ubcx-software-development/
That indeed is the course the top comment is talking about.
The instructor Gregor Kiczales has a youtube channel named 'Systematic Program Design' [2]. His 5 minutes intro video [3] is really good IMO - one can send it to ones relatives or friends who ask you what the heck you are doing in your job.
[2] https://www.youtube.com/channel/UC7dEjIUwSxSNcW4PqNRQW8w