I want to get a camera that I can use mostly for nature pics and graffiti pics out the window of a moving train, and maybe a butt or two (consensually ofc). Yes I know I’m weird. That said I guess I’ll need a “fast” one for the train, if that is the correct terminology (I think for shutter speed, yes?) The only other requirement is I will not download programs or apps beyond FOSS, preferably something I can just take the SD card out of and plug it into my laptop (linux anyway, most programs don’t like me).
I don’t see myself making this my living (and if I do then I can always upgrade) just as a hobby and maybe some side hustle if the opportunity knocks, so I don’t need the best camera, but I would rather buy nice not twice (unless I leave “hobbyist” and move to “professional”). That said I was thinking maybe a DSLR would be enough for me (if not, I could be persuaded to mirrorless, just trying to keep costs down)? I’ve heard good things about the Canon Rebel, idk. I’m not really trying to go over $1k (and even cheaper than that would be even better) especially if I have to then buy a lens or two.
Any recommendations are greatly appreciated, I have no idea what I’m doing lol.

For RAW editing you can use darktable
But good luck finding a camera with open software, maybe a PiCamera ?
Well to some degree beggars can’t be choosers, but I can just not give the camera my wifi or take it offline if I did temporarily, so that’s fine though it would be nice to have FOSS. The part I’m really concerned about is I don’t want to have to use some “fujifilm connect app/program” to access my photos or settings or something, I want just “pop out SD, put in PC” and/or usb connection. Everythings got a damn app these days and I’m sick of it lol.
Darktable sounds perfect!
Most cameras use SDs and save photos there. You can just copy and paste.
The apps are more like addons, targeted to casual/beginner photographers.
Oh, every big camera brand uses SD cards (apart from their pro gear which often uses CFExpress cards). Apps are often half-baked second class citizens, which will refuse to work half of the time so you won’t loose much functionality. Connecting your camera to your wi-fi or if you really don’t want to, a mobile hotspot is required for certain software updates you can go without from a technical standpoint, but they are mostly worth-it.
Well that’s good to know!
I can do wifi for updates and then remove the password from the camera so that’s fine, most likely I’ll just do it at the library. I just don’t need it always connected or anything like that, like y’know fridges and propane grills are for some inexplicable reason.