Understanding the BRRRR strategy

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Hi, I'm trying to understand the BRRRR more in depth and I have questions.

1.) Do I have to go all in and pay off the house at once or can I down 20% on the house and slowly pay it off every month with the cash flow from renting the property.

2.) Wouldn’t I still owe money on the house after refinancing? Cause if I’m doing a cash-out-refinancing wouldn’t I take out a new loan to pay off the old loan? So wouldn’t that leave me to pay off the new loan?