In any competition, knowledge of your opponent is fundamental.
I always thought Trump was trying to figure Clinton up. Like I always thought the things he said about her were bombastic for his supporters but in reality he had some underlying strategy (wrong as it was).
But he IS an idiot. He knows NOTHING about Clinton, and doesn't care to learn more about her. He is so arrogant that he thinks that only by standing up and saying idiotic shit, he can beat her. He does believe he won the first debate, it's not just a pr strategy bluff. The commentary about HRC not prepping is useless. It won't intimidate HRC, it won't create any narrative since Hills just has to upload a picture of her working hard to counter that.
He really thinks he is unbeatable. Months of Clinton not doing public appearances have lured him into a false sense of security. Clinton is pounding the road, working the people and walking the walk. And she is beating him. But he thinks she is speeing somewhere