I, however, still believe that "we live on a spinning ball, surrounded by evermore spinning balls"
What's more. My experience tells me that even if we knew the whole truth, it would be very hard for us to believe it. So we will always move to some degree in guesswork and half-truths. And that will never change.

Landing videos were made just in case.
There are traces of human landing on the moon that can be observed with an ordinary telescope.
There is also a mirror on the moon that constantly reflects the laser and measures the distance from the ground.

There is a lot of interesting stuff, but flat earth was a prank/joke.
Two friends made a bet with each other. One was to prove that he would be able to convince people that the earth is flat in the 20th / 21st century and he did it ^^