Do you need the full cash amount to flip a house?

[Tkai Savage]

I don't quite understand how flipping a house works. I understand that you buy the house for a low value fix and renovate it, and sell for more than what you bought it for. Can you get a conventional loan to purchase the property, but how do you sell the property if you still owe money on it from the bank. Are you able to use the brrrr method while flipping a house.