I think it's a reasonably well-established fact that from 1969 until 1972 a total of twelve human beings have walked on the moon. Taking into account the fact that the technology to fake the moon landing didn't exist until after the moon landing and the fact that if NASA was willing to fake accomplishments they would have done so again it's honestly stupid to say that the moon landings didn't happen (unless you're a philosopher claiming that nothing is real or something, in which case I would rather not get into that argument).
All that said, though, everyone has heard the stereotype of either conspiracy nuts or idiots who don't think the moon landings actually happened, though I have never actually met anyone in real life who believes that the moon landings were faked. Are there actually people who claim that the moon landings were faked, or is that just a running joke in modern culture or something of the sort?