beginner camera

if you are looking for a DSLR an important thing for astrophotography is the sensitivity in the H-alpha region of the light spectrum, as red nebulae emit in that wavelength. Most DSLRs are equipped with a UV-IR cut filter that removes that wavelength, but it is possible to remove that filter and replace it with a filter transparent to H-alpha. I think it is possible to buy a used DSLR already astro-modified for around 100-200$, you can look for example at cloudy nights classifields (recently I sold mine there for that kind of price). If you already have a telescope with a good tracking mount the best is to have a dedicated cooled astrophotography camera but that is more expensive. You can browse images on astrobin to see what people are using. In the case of a dedicated astro camera you need to think carefully about the size and resolution of the sensor you want, as it is going to define a lot of things like the field of view (large sensor = wider field of view for the same telescope), and noise level (small pixels = more noise, also need sharper optics). There are a lot of youtube videos about DSLRs and astrophotography, for example the one of Nico Carver.