Down payments

I read if you’re buying a used car, you only put a down payment of 10%. 20%-30% if its a new car. l found a car that’s over $2000, and my boyfriend did the math and said 10% of that is $300 or $200. Could I theoretically only pay $200-$300 for the car, and make monthly payments if the dealership has that option? I really need one, but just can’t afford to pay everything upfront with the rent I have to pay.