Sensor. If you don't own one, get an air blower. The type you squeeze by hand.
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Will try this, thank you!
Either dust on the lenses, or if you switch lenses and still see them then its dust on the sensor, pretty common, can take it into a camera shop to get it cleaned or you can get a kit to do it yourself
An air blower probably won’t remove all the spots, if you have a camera shop nearby book a sensor clean. Or purchase a sensor cleaning if your comfortable doing yourself, scary at first but not too difficult - Check out YouTube.
Sensor, back glass on lens, front glass on lens. Get an air blower onto all three and take a picture of a blank wall at f22 or so and that should give you an idea of what's left. You can get specific zeiss lens cleaning wipes that can help (do not use on your sensor just lenses). Anything on the sensor should be loose enough to get blown out by a blower.
If there are still a lot of spots then a sensor clean by a professional (until you become comfortable with that process) is the way to go.