Sounds like you're learning the wrong things, especially if you're defending someone like Trump of all people.
Trump was never a good businessman. Not when he filed for bankruptcy 6 times and has billions of dollars in debt. He was handed a silver platter inheritance money and he just did whatever the fuck he wanted with it. He doesn't know much about economy, especially when he thinks raising TARIFFS of all things would help the economy except it doesn't work that way and would instead punish the consumer more.
Business is also partly about trust and he has none of that. Only corruption, lies, and broken promises. He wants to be president to have power to control others like the dictators/tyrants he looks up to (Putin, Kim Jong-Un, Hitler, etc.) and run away from his own crimes and responsibilities.