If they are so simple why do they take 4 months of 15 hours a week on an online course to learn? Or, why do I (who did pretty well in my AI class in my Computer

If they are so simple why do they take 4 months of 15 hours a week on an online course to learn? Or, why do I (who did pretty well in my AI class in my Computer Science program 10 years ago) have such a hard time with it? The way I see it there are two options based on this article: 1. Either I am stupid - I hope not :( 2. The people who teach these courses are terrible at teaching Third option: 3. This article is vastly oversimplifying I'm actually leaning towards a mix of #2 and #3 but I'm biased against #1.