HOW TO BUILD YOUR PORTFOLIO BRRRR METHOD

BUY a nasty home using short-term money (private money or cash)

REHAB using those same funds, and make it "tenant-proof"

RENT the property out to great tenants and have minimal repairs due to the rehab

REFINANCE with a 70% ARV loan so you can pay back #1 above

REPEAT the process now that your short-term funds are returned.