Kerr vs non Kerr blackholes is where I usually start replying with "we don't know" to every second question. But broadly speaking the inside is theorised to be

Kerr vs non Kerr blackholes is where I usually start replying with "we don't know" to every second question. But broadly speaking the inside is theorised to be a 1 dimensional torus having only diameter as a measurable quantity other than the location of its center of mass. This is opposed to a zero dimensional point having only the location of its center of mass. This means the mass is distributed through the torus and is "less infinite" in the aleph zero vs aleph one kind of way. It just gets weirder from there haha