It is would easier to find things that Trump is knowledgeable about. I’m assuming he knows he knows something about New York and Florida real estate despite his bankruptcies in those areas. His primary concern with the presidency (that he thought would help him recover his canceled TV contract) is focused on opportunities for hundreds of millions in corrupt exploits. The areas of his most stunning ignorance are the US Constitution that he is in impeachable defiance of and federal laws that he mindlessly confesses having broken.
The dude is out of room and the walls are closing in. He also wandered off again at the G20 and had to be found and brought back