I happened across this recently and it's a pretty good "quick and dirty" on watch movement makers. It's a good read for anyone who's interested in understanding what sorts of things are available.
http://www.mattbaily.ca/en/blog/2012...ment-calibres/
I'm not sure I agree with all the author's subjective comments, but that doesn't make the article a poor resource for folks seeking a rough understanding. I think newbies who read the writer's subjective statements may not recognize them as such and may be inclined to blindly accept them and act in accordance with them. A better approach would be to dig a bit deeper to get a more comprehensive picture. Doing so will provide the reader with an understanding of which statements reflect market realities versus which reflect irrevocable or indisputable facts.
All the best.