I have noticed fluid stains under my newly bought car; can you suggest which fluid is leaking from my car?

Modern cars have many types of fluids that can leak like: coolent, engine oil, power steering fluid, transmission fluid, brake fluid, windshield washer fluid etc., so I cannot say anything for sure without checking the car out in person.

You can figure out what type of fluid and from where it is leaking by checking the origin of leak, fluid type and location of the leak etc. but to solve this problem, it would be better to take your car to your local Datsun service center or to some expert mechanic.