Congratulations! You’re a professor that has just been hired by a university to teach a course on Harry Potter, and you have free reign on the material you want to teach. Since everything is up to you, how would you teach your material? Would you require the books to be used as textbooks? What would you title the course? Is the class’s content general knowledge and information? Or is it something more specific: does it focus on analysis, symbolism, or make connections to religion? How would you keep the material fresh and interesting for the students enrolled? Other than lessons of the wizarding world, what real life applications could come from your course? And what would your final exam consist of?
Way back when I started Uni, I was a film major (and when I transfer I plan to try and keep it as a minor), so I think I'd take the approach of comparing the books to the films. The books would be mandatory reading, as well as some books on cinematography and readings about the different directors.
The reason I'd want to compare it is the films is that they differ greatly. There are many aspects I really wish were in the films that just didn't make it. Comparing them, there are certainly scenes I would have liked that just wouldn't have been able to make the cut because they were lengthy and didn't add too much to the basis of the story that the directors wanted to tell. There was also some issues with starting the movies before the series was even done, which now isn't an issue.
Another thing comparing them and analyzing does is that you can pick out what people find are the most valuable aspects of the books, and that differs from what was portrayed in film. The romances were played up a lot, and there are many problems with hacking at characters while perfecting others. Who the directors were can play into this a great deal, which would also be something to go into further. How the different directors styles and emphasized motifs and content change.
The different mediums also are very notable. With the books, assuming you haven't been influenced by the movies, you picture everything yourself taking things from your own life to shape and contextualize the books. The movies you are getting someone else's view into this world that can differ very much. Cinematography certainly got more impressive as the films went, going beyond just world building.
A benefit of the films is that there are scenes added that help with the flow of the books. We are largely following Harry, occasionally going to other characters if they are really relevant. In the films, you can add scenes with the Ministry and Hermione leaving her family that help explain and emote scenes that were only mentioned in passing if at all in the books. However, and I'm using my parents for reference, this didn't do too much in helping with the continuity of the films in terms of making the story make sense when you had not read the books. While people who have read the books can make the connecting easily and without really thinking too much on it, people who have not can just get lost in the movies and not follow the importance of interactions or the context. Films are generally supposed to present the material in another medium so more people can access the same content, but there are issues with it when so much of relevant story is cut.
With it being a comparison of the mediums, there'd also be the question of if turning them into movies was the best route. I'm a firm believer that book adaptations should be tv shows rather than movies. There is just so much content being left out (and even in books adapted to tv shows there is still so much left out), but you have the ability to bring the focus to more characters and subplots or even just the main plot. Depending on how long the season is, it could be a 12 hours production for one books like how Game of Thrones tends to be done, or nearly 18 hours if it were made into a 24 episode, 42 minute season. This gives you the flexibility and ability to hash out characters much better. Like, Marauders and Founders, and Order of the Phoenix Eras could all have at least on episode each, Marauders especially having a few here and there as they come up a lot.