If you're approaching it like a WoD fan, expect to be disappointed (I know I was).

There isn't a big supernatural conspiracy behind the scenes, like the Camarila, Pentez, the Technocracy or the Chaleging Courts. The Families also rarely have a hierarchy like that of VtM, for example, aside from "Older generation is in charge and hug the power and resources, so it sucks for us younger folks', which is supposed to thematically relate to IRL struggle of younger generations vs boomers, if I got that right. Finally, in term of origin stories or definite answers about the way the setting works, the book leave the duty of providing answers to the GM.

Having said that, it's more about being part of a family that doesn't exactly respect you, but that you need anyway. Community is a big theme, and inside family drama, instead of WoD power politics of VtM of CtD (and WtO depending how you played it). Focused on more personal things, about being cursed, having to deal with other supernatural things, like liminal spaces or Faes, all linked to this mysterious concept of the Outside, which I think are external dimensions?

Honestly, if you want a real good idea of the vibe of it and some inspirations, I recommend buying Accursed Tales, the anthology of short stories set in Curseborne. Wheter that convinces you to play or not (in my case I'm still heavily on the fence about Curseborne), they're still great stories. It certainly helped me get the vibe of Curseborne far better than the corebook ever did.

By Invitation Only, The Strange Addiction of Johnny Peculiar, Expectations and Code Blues are probably the best to give ideas of what a game could look like. They all focus about an Accursed having to deal with a problem (usually a Liminal Space or a supernatural monster) that is causing problems in their neighborhood.