The electrical… Ugh

My house came with a 100A box with six breakers, all unlabeled. One of them did nothing at all when I flipped it, another produced a loud humming for three or four seconds before tripping off. I still don't know what the humming was but when I rebuilt one of the walls I found a big scorch mark on the stud next to one of the outlet boxes so I suspect that was involved. The one that did nothing it turns out was connected to an MC cable that had simply been sawed off clean -- not even some electrical tape wrapped around the cut end -- and jammed down into the framing completely live. At least I was able to repurpose that one into a circuit with receptacles and lights in the attic.

So glad my house is frame on slab and the original owner was in jail for csam most of his life. His niece sold it to us after he did the only decent thing. Haven't found a single sketchy diy fix in a year living in it aside from the weird DNS settings for the router which I promptly torched once I could afford. Anybody wanna guess why I had to look all the way to the routers DNS?