When designers go to print out a flyer, poster, banner, or something like that. What type of paper is generally used? Sorry if this is a dumb question but, I don't print much. So far, I have been using matte paper but, I am wondering if there is some other type of paper that is better quality. I mean I have premium glassy but, I don't quite want to use that paper on it.

it's all personal pref. and it all depends on what you are printing such as bcards, brochures, ads, etc. i normally stick with a heavy weight matte.