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[American Horror Story] Can someone please explain what the hell happened the first season

I just finished and I got some of the plot but the other half seemed random and nonsensical. Can someone please ELI10 what I just watched.
gpt
The House is haunted by the ghosts of its previous inhabitants, who all died under unfortunate circumstances and are now all quite bitter about the whole thing. Anyone who dies in the House is cursed to haunt it forever, which ends up happening to the family who the story follows. Tate, the blonde kid, was a ghost all along and convinced the daughter to kill herself about halfway through the series, meaning she was dead too before anyone noticed. 

Everyone is dead at the end of the series but, somewhat ironically, this seems to  ends up helping their dysfunctional family situation.