I think Trump knows far more than most about how to manipulate and deceive people, but little else. I think Elon used to know a lot about managing engineering teams, but hubris has been cancelling that knowledge.
A few Trump quotes just for the heck of it
June 2015: “There’s nobody bigger or better at the military than I am.”
July 2016: "So a general gets on, sent obviously by Obama, and he said, 'Mr. Trump doesn't understand. He knows nothing about defense.' I know more about offense and defense than they will ever understand, believe me. Believe me. Than they will ever understand. Than they will ever understand."
Nov 2015: "I know more about ISIS than the generals do."
Nov 2015: "I know more about courts than any human being on Earth."
Mar 2016: "Nobody knows more about trade than me."
Apr 2016: "I know more about renewables than any human being on Earth."
May 2016: "I think nobody knows more about taxes than I do, maybe in the history of the world. Nobody knows more about taxes."
July 2016: "[L]ook, as a builder, nobody in the history of this country has ever known so much about infrastructure as Donald Trump."
Feb 8 2017: "I understand things. I comprehend very well. Ok? Better than, I think, almost anybody"
Dec 2018: "Technology — nobody knows more about technology than me."
Jan 2019: "I know more about drones than anybody. I know about every form of safety that you can have."
Want video evidence Trump said these things?
[media=https://youtu.be/sR3f95BGIiA]