understanding the 1st time home buyer 4% vs 20% downpayment

[Sonny Nguyen]

hey biggerpockets family, 
this might sound silly to some but i am a first timer home investor.
i keep hearing what i can and cant do's.
my question that i need answerd is, if im planning to buy a home , rehab it and then flip it. i would have to put down 20% tp purchase a home vs putting down 4%. is that correct?

thank you