entrepreneur noun en·tre·pre·neur \ˌäⁿn-trə-p(r)ə-ˈnər, -ˈn(y)u̇r\
: a person who starts a business and is willing to risk loss in order to make money
I also understand risk. Trump made almost all of his money in real estate and entertainment, not in “business”.
What is your point? Real Estate and entertainment are not businesses? Or that there is no risk involved.
That you ask is a testament to your lack of understanding. He used other peoples money as leverage to buy properties at a time when property values were quickly rising.
Without the family connections he would not have been able to obtain the financing.