I have a degree in English I can’t do much with, but I can criticize your grammatical and artistic choices with it! For money!
My experience largely consists of having copyedited the student newspaper in college in AP style, but my major meant I was doing a lot of MLA-styled papers, and I do own a Chicago Manual of Style. In any case, most of it is much the same with commas and dependent clauses and setting people on fire in my mind for confusing reigns and reins. That comes up more than you’d think in fantasy fiction.
Authors can use this thing here to get in touch.