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I'm sure you could find what you want by Googling, but a few things to start you off.
Firstly, up until very recently, film had better resolution than digital cameras available to amateurs, around 30Mps. It therefore wasn't digital per se that was responsible for the leap in image quality, but what was done to the image after acquisition, namely stacking and processing.
The down sides to film AP were having no idea what was captured until the
film was developed, the cost of film, manual guiding [ a true pain in the neck,literally], and gas hypering very slow [25 ISO] film to increase its speed so an image could be obtained before I went cross eyed from guiding for long periods of time. Film suffers from two phenomena that impose limits on film that could be used; grain [ analogous to noise], and reciprocity failure, which is the film's ability to record an image diminishing as the exposure gets longer, which doesn't happen with digital imaging. The faster the film is, the more grain it displays, just like noise increases with higher ISO in digital cameras. The only processing involved was called
dodging and burning, which was carried out during the film developing and printing in the dark room.
Hope this started you off,
raymo
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