What really is absurdism?

I'm new to philosophy, and the philosophy that drew my attention the most was absurdism. I happened to read a quote by Camus, not per se but it was something like 'you'll never be happy if you continue to search for what happiness consists of, you'll never live if you're looking for the meaning of life'. This makes so much sense. It's like trying to fall asleep and thinking of falling asleep, but you DON'T fall asleep, because you're thinking about falling asleep.
And absurdism is an extremely good coping mechanism. It's the crazy fact that in this grand scheme of the universe, we're small and tiny specs. Compare yourself to a star. 80 years to 3000000 years? What can you hypothesise really? Nothing matters. And you can just laugh about it and let it go.

p.s.- I'm new to this and I'm willing to learn more.