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How do you invest in real estate without using money?
Sounds like the seminar is about using OPM (other people's money), which means you're going to have to find not just real estate, but investors.  Those investors are going to need a business plan, contracts, and a lot of work from you to provide as much equity as possible before the property is sold.  If you're serious about Real Estate, I suggest finding the most successful broker/agent you can, buying them a beer, glass of wine, or cup of coffee, and picking their brain about it. It'll be cheaper then a scam seminar.