You probably write shorter masterpieces, like articles, blogs or news stories. You don't have room (or time) for extra space and punctuation. Keep it simple!
Be sure to tell any editors or proofreaders that you work with that you follow the AP Stylebook!
You probably write books, fiction stories, or academic papers. CMoS is all about making sure your work is readable. If you want to make sure your work is consistent across your entire career, you can't find a more comprehensive style guide.
Be sure to tell any editors or proofreaders that you work with that you follow the Chicago Manual of Style.
Are you Canadian? If so, you must get frustrated when people tell you that your spelling is inconsistent. At least you don't add an extra syllable to aluminum!
Be sure to tell any editors or proofreaders that you work with that you follow the Canadian Style.
If you're not Canadian, be sure to set your language in any word processors to the version of English you use. This way you can be sure your grammar and spelling are being checked appropriately (not that you should rely on spellcheck!)
Are you British? Or maybe Australian (imagine I've zoomed in on the flag...)? If so, then you probably get annoyed when Americans tell you that you use too many letters. You want your quote marks single and don't ever call it a period – full stop.
Be sure to tell any editors or proofreaders that you work with that you follow the New Hart's Rules.
You don't want to have to follow someone else's rules. When you are writing, you want to focus on writing. That is fine! Create a style guide for yourself. A document you can share with any editors or proofreaders (or subcontracted writers, because you are building an empire!), so they know how to keep your work consistent from one piece to the next. And so you can spend more time writing and less time worrying about where to put that comma.