A real estate strategy comes from the abbreviation of Buy, Rehab, Rent, Refinance and Repeat.
B: Buy (an undervalued property)
R: Rehab (renovate the undervalued property)
R: Rent (bring tenants in to get cash)
R: Refinance (get a new loan from the increased value of the property to pull the cash out)
R: Repeat (use the refinance cash to buy the next property)