finance questions on rehabs

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Hi, I am new to this site pretty new to REI. My dad has done a couple rehab house but he holds them for some time to avoid being taxed. I want to start rehabing houses then sell them as quickly as possible and not holding them. I was wondering what the best way to go about this and making the most profit as possible. What would be the best way to pay for this as I dont have an insane amount of money I am most likely going to have to borrow from the bank. Also how could I avoid being taxed twice?