Is the Earth flat?

I just had a friend inform me he is now one of those who believe the Earth is flat. And he was skeptical at first but after a year of reading, researching and discussing it with like minded people, he is now a believer.

I just said, “Ooooooookaaaay…”

Not sure if I even wanna Google and research this on the internet. And I’m too lazy to even try. So I’m relying on friendly jellies to give me info on this so I can tell my friend he’s totally wrong.