There are innumerable sources online for improving technical writing and they all generally repeat the same conventions and "rules". I tend to warn people, thou

There are innumerable sources online for improving technical writing and they all generally repeat the same conventions and "rules". I tend to warn people, though, that over fixating on technical writing will not make you a great writer but just a capable technical writer. If you're looking to improve your writing in general, then I think Joseph Williams' "Style: Towards Clarity and Grace" is the single best book on the subject written so far. Rather than simply state certain "rules", it methodically workshops examples to show how you can write and rewrite a sentence to change your meaning and emphasis at will.