What Are Therians And Other Hearted Anyways? (general overview)

Hello! You can call me Velcro and I am here to inform poeple about therians & other hearted. And if anyone says: 'but Velcro! You can't inform poeple about otherhearteds when you aren't one!' Well, rest assured heaps of my effort has been poured into researching them and I've had all info on otherhearteds checked by my otherhearted friend. Anyway, go ahead to dive in!