This is a subject on which there are many threads on this forum. Your subject line says "edit" your question says "post process", for me there is a difference between these two things, I would classify editing as more heavy alteration of an image than post processing.
Assuming digital images then the thing that is recorded by the camera is a set of numeric values that represent light intensity of different colours at points on the sensor. So what the camera “photographs” isn’t even a picture that humans can understand. The digital data has to be rendered in a way that can be displayed for your eyes to see, essentially this is post processing, so even if you just take jpegs off your camera and print them, they have been post processed, this may have been done by the camera default settings rather than you making any specific decisions but somewhere the white-balance, compression level, etc. has been applied in post processing. Most people who want to make the most of their photographs do not leave it up to the camera to make these decisions, they capture the images in RAW and then make their own decisions about levels, white-balance, etc.
The upshot of this is that for those photos which are worth keeping most serious photographers will do some post processing. This has ALWAYS been the case, in the days of film and wet printing, serious ‘togs still post-processed in the dark room to get the most from their photos.