Reference works used
See the subpage Reference works to see which books and resources I routinely use in proofreading.
I publish a blog on a separate page with my take on English language matters, but here I will explore what others have to say about writing.
In June 2016 the Oxford English Dictionary published a list of recent additions that include new words or revised definitions of existing entries in its online dictionary.
The update includes such entries as air punch, eleventy, glamp, and power couple.
Professor Larry Trask, late of the University of Sussex, who had a special interest in linguistics and grammar and was author of several books in these subject areas, has published a very useful online guide to punctuation.
I find his book Mind The Gaffe: The Penguin Guide to Common Errors in English so helpful and readable.
There is also a very useful blog The Comma According to Trask.
Writing style guides
The Oxford University Press (OUP) has a very useful style guide that is available online.
Although intended for use by OUP staff in their written communications, it is a useful interactive guide on such subjects as abbreviations, contractions and acronyms; capitalization; numbers; punctuation; and word usage and spelling.
If you are not a fan of waffle and jargon, but prefer simpler and clearer communications there are several free guides available from the Plain English Campaign.
There are also useful tips on writing business emails, CVs, letters, reports, forms, and content for websites.
The BBC has an online journalism style guide.