system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Nihilism and it's concepts

So I'm currently reading "Fathers and sons"  by Ivan Turgenev and I can't get my head around the concept of nihilism explained by Bazarov despite googling it. 

What does it mean by nothing exists? Or that nothing has any value?
gpt
There are different forms of nihilism. The most commonly examined is 'existential nihilism' which basically states there is no intrinsic value in life. Simplified, the universe exists. In that universe, you come to exist, not because you are meant to, or supposed to, but just because it happens naturally, like bacteria growing on old food, and you will eventually die, and that this event is essentially insignificant with respect to the universe. Hence, all meaning we draw from life is invented by us. Your life has no real purpose or result of significance in the totality of things.

There are other concepts of nihilism, which posit that knowledge is impossible, or that reality is false, or that morality does not exist. It is a broad topic. The unifying theme however is that some aspect of what we consider 'meaningful' either is not truly meaningful, or does not actually exist.