@InGodWeTrust as someone who used to be a salesman, don't listen to dumbasses like
@CrimsonTider.
Putting money down allows the lender to see you as a more attractive and trustworthy applicant, and will almost always result in a lower interest payment.
The difference of even 1% on 60 months is about $1,000 on a $40,000 loan, and that assumes the difference would only be 1%. (It'd likely be more.)
A credit score in the low 700s is good but not "wow look at this guy good" from a loan officer perspective; the dudes that put no money down and had good interest rates (less than 2%) were in the low to mid 800s.
I worked a deal for a couple of docs that wanted a popular Honda SUV and they had money down and were both in the 800s, and just barely made that 2% cutoff. )This was back before the chip shortage as well.)
You should put no less than $500 and probably no more than $3-4000 down on a lower-model Civic or Accord. Some of those cars have $40+k stickers so unless you want to be paying 800 bucks a month for the next half decade, put as much down as you can without dipping into emergency funds or depleting your savings.
Also, remember that interest rates are lower on new cars and not used ones.