This isn’t going to be a long post.
I frequently give training on writing to technical folks because I have found that to be one of the easiest things to fix among technical people. Just like the accounting analogy, nonlinguistic majors must be able to articulate ideas in ways that help them advance their careers. When I taught grad school, I took a full letter grade away for spelling and grammatical errors—that’s how important this is. Check out these two posts and then spend some time using your new found Google skills to find more resources on improving your writing: