The claim is "Nothing Matters"
Nothing in the universe has any meaning, purpose or value whatsoever.(this doesn't mean there won't be consequences for your actions... what it means are those consequences don't mean anything either)
I don't mean this just Absolutely speaking, I mean it in every possible way that anything could mean anything(which it doesn't)....including relative.
It doesn't matter whether you sit on your couch and eat cookies until your age 42 and die of a heart attack or you become the President of the United States and save the planet from the third world war nuclear attack.
There is no one here for it to matter for...
This isn't bad news... this is pure unconditional freedom for No One.
Nothing you do has any significance. You are just one individual among a species of primate with billions of relatives living on a tiny rock in the middle of nowhere. So why do you worry all the time?
Why do you fret over what other insignificant primates think about your own insignificance? Who cares what they think? The rest of the Universe certainly doesn’t.
Why do you panic about deadlines and let that panic paralyze you? Trust me, your work is not worth the panic. Your work doesn’t matter. There’s no point in getting all worked up about work.
Why do you care so much about getting money? So that you can buy things that don’t matter? If you have enough food to eat, what’s more money going to do anyway?
Why do you hold on to the hurt from when others have wronged you? What they did has no significance at all. Let it go: set it adrift among the stars and all the empty blackness.
There is a certain usefulness to the nihilistic vertigo that comes from casting your gaze across a cosmic scale. We silly apes spend so much time fretting and worrying about our imagined importance that we miss out on The Thing.
The Thing is life is a remarkable and unlikely gift. It doesn’t matter if you are religious or anti-religious, or some more reasonable perspective in between–life is a gift. Some of the power of the Universe coalesced into a little bit of matter and energy that can know it’s here: you. You can see a sunset, climb a tree, kiss another living fragment of the Universe, and laugh. Even more powerful is your ability to extend grace, friendship, and kindness to other bits of the Universe. You can’t do a single thing of cosmic importance. 
So tell someone to have an amazing day. Tell a stranger that their shoes look awesome. Embrace your smallness when you think about your problems and stress, but own your incredible power when dealing with other living things. You are small, but you are very big to other small things.
Enjoy the freedom that comes with being alive. Don’t let the grind of all our imaginary importance take away The Thing.
" Nothing real can be threatened, nothing unreal exists, herein lies the peace of God"
- A Course in Miracles