A great free online resource is the Stanford Encyclopedia of Philosophy. Here is their entry on The Meaning of Life:
https://plato.stanford.edu/entries/life-meaning/

However this might be too academic for your needs. An author that has definitely pondered this question and presented it in a very funny literary work is Douglas Adams in his trilogy in five parts "The Hitchhiker's Guide to the Galaxy". This story follows Arthur Dent as a space hitchhiker and the many absurd situations he finds himself in. Light-hearted as this story may be, it portrays several philosophical themes. And if nothing else, it will put a smile on your face and keep it there.
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