The First reason why it is fake is On the outside of the earth there are some radiation waves that kill the astronauts before reaching the moon.
The Second reason why it is fake is        Most of the photos are very well framed and there are shadows in different directions, as if it had been done on a film.
The Third reason why it is fake is In the photo you can see that the flag moves as if it were windy and in space there is no reason why it does not make sense.

The First reason why it is real is There are pictures with astronauts and the earth in the background that's why they could not be on earth.
The Second reason why it is real is         We can see that the man left footprints when walking on the lunar surface.
The Third reason why it is real is In some missions to the moon they have left robots that have collected stones and brought them to earth.