My usual advice: Start with three books: (1) The most thorough book on English grammar you can find. (2) A relatively complete dictionary of English. (3) St

My usual advice: Start with three books: (1) The most thorough book on English grammar you can find. (2) A relatively complete dictionary of English. (3) Strunk and White, The Elements of Style. Then (1) Write, about nearly anything for nearly any purpose, and think about what you would like to do better. (2) Read some relatively good writing and see if by example it provides some good answers the questions you had in (1). Then rinse. Repeat. Many times. My evidence is that good progress takes years: When I was a college prof I noticed that the much older evening students were much less good students except for term papers where they were MUCH better. Net, learning to write well takes time. For some good writing, in math read Paul Halmos. In science, read a good freshman physics book. These examples are high among the best ever at communicating rock solid information with some of the greatest clarity yet achieved and are crown jewels of civilizations. For persuasive writing, practice on, say, Reddit or other fora and see what reactions you get. Rinse. Repeat. Many times. For writing for the humanities, mostly just learn about humans. For this purpose, my favorite Humans 101 for Dummies is the now classic E. Fromm, The Art of Loving. Then for Beowulf and Chaucer through Milton, Shakespeare, Wordsworth, Byron, Shelley, Keats, Dickens, and Henry James to the present and for the rest of this millennium in English literature, and its history, techniques, values, and goals, I would treat it as at best meaningless and otherwise as toxic waste of great danger to humans, this far into the 21st century still stuck before the 18th. Here I am straining as hard as I can to be astoundingly diplomatic and omit remarks about detritus of the ascent of man, effluent, and septic tank of civilization. Actually in England in the 1600s there was a good writer, Newton.