Million Dollar Listing star Fredrik Eklund currently leads a real-estate team closing $15 billion in property sales, but he didn’t need a four-year degree in the field to make a name for himself. While schooling can help people figure out how to crunch the numbers, the Gen X multimillionaire says there are certain skills, like communication and negotiation, that are hard to learn in the classroom. He suggests Gen Z hit the “mean streets” for years to build their real-estate portfolios—no diploma required. ...