If you want something physical to read, Glenn Fleishman (@glennf@zeppelin.flights) wrote a book called How Comics Are Made. https://howcomicsaremade.com/

From the description:

This covers the whole ball of wax of how artists, knowing their newsprint medium, drew their comics and marked drawings up for color reproduction; how printers put that work through the most arcane and impossible-to-believe operations to get them onto paper...

I think it's mostly focused on comic strips in the newspaper, but I'm guessing the process is mostly the same for comic books.