I only contend on two things. First is recommending Strunk and White - in general a style guide should not stifle writers' voices and instead equip them with tools to express their own. Here I would rather recommend the far more authoritative and comprehensive The Chicago Manual of Style [1]. Second is excess punctuation - easily incurs in too much line noise. You should generally avoid adding distracting elements seldom added pro forma.
The best source for me has been the Handbook of Writing for the Mathematical Sciences by Nicholas J. Higham [1]. His I can fully get behind. Another is Writing Mathematics Well by Leonard Gillman [3]. Still another is Mathematical Writing by Franco Vivaldi [4].
[1] https://www.chicagomanualofstyle.org/home.html
[2] https://epubs.siam.org/doi/book/10.1137/1.9781611976106
[3] https://bookstore.ams.org/mmbk-7/
[4] https://link.springer.com/book/10.1007/978-1-4471-6527-9