This story is available exclusively to Insider subscribers. Become an Insider and start reading now. Many small investors with limited backgrounds in finance or real estate are still making passive incomes by investing in flipping and reselling run-down properties or starting a process called BRRRR: Buy, Rehab, Rent, Refinance, Repeat. Veterans and investors share with Business Insider how they got started, and what it takes to successfully make money while using BRRRR. They recommend spending a significant amount of time and effort to learn how to inve...