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www.apstylebook.com/ — This is a gold standard for journalists. While I like flipping through the spiral-bound print version, there is a more traditional paperback style and it’s available online. It’s inexpensive and useful for non-fiction writers, since so many places use it as their default stylebook.
Chicago Manual of Style
www.chicagomanualofstyle.org/home.html — This is a gold standard for academic writers. If you don’t want to buy it, look for it in a library near you.
owl.english.purdue.edu/owl/ — This resource has great tips on U.S.-style grammar and usage. (There are no Oxford commas here.) It’s free and available 24/7. It is designed for academics, but any writer can use it.
www.poynter.org/ — For non-fiction writers, this is a great site not just for writing tips, but also for industry chatter and for ideas that might turn into your next book.
The Creative Academy for Writers https://creativeacademyforwriters.com/ — A group of Canadian writers has put together an online academy with discussion groups, a 24/7 online writing room, and much more. You can pay what you want, but they are happy to let you take part in its many activities while you explore.