The Elements of Style and Pinker's The Sense of Style. Now I have another resource to recommend.
Benjamin Pierce writes:
In 2021, Rajeev Alur and I created a course at Penn called Writing and
Speaking with Style. Aimed at PhD students in computer science and other
areas of science and engineering, the course is a semester-long immersion
in effective technical writing and speaking. Since then, I've run it twice
more, improving and polishing each time. I think it's pretty good now. :-)
In hopes that the course materials may be useful to others, all the slide
decks, timeline, readings, and detailed notes for instructors are now
publicly available: you can find it all here.