What proof is there that neil Armstrong went to the moon?

Answer 1

Despite rumors, Neil Armstrong did land on the moon.

To resolve the rumor that, "because the flag appears to be waving in the video, then it can't be the moon":

The astronauts there propped the flag in a way that it appeared to be waving, as opposed to the original position, which was considered unpatriotic.

Answer 2

Sounds like you saw Capricorn One. With the right telescope you can see his footprints.
Of course Neil Armstrong walked on the moon, there are photographs of it , from the launch to the splashdown , so just watch it.