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I really don't know what the whole 'free will or nah' argument is about but everyone always mentions it so pls gimme a rundown if you have some knawledge (Does it even matter tho is my qn)

Basically, your choices have prior causes, so they are predetermined. From your subjective perspective you have free will, but objectively you don't.

Free will exists because moral responsibility exists.

Moral responsibility doesn't exist outside of a social context. It's something humans create. Humans have agency in that some of the causality flows through our mental processes and thus through us, as subjects.