Cate wrote: “We are trying to build up useful resources for students of all ages…. We’ve compiled a list of the most useful grammar, proofreading and writing style guides on the Internet into one, easy-to-navigate article.”
Her writing resources are indeed a treasure trove. Among the gems on her list:BBC Proofreading
Proofreading tips, practice exercises, and quizzes to test your skills. I aced the Level C (Superstar) proofreading test. But I admit that the question prompts and the multiple-choice format helped me catch errors I might have missed.
The Online Grammar Guide
The comprehensive guide to English grammar created by Jack Lynch, associate professor at Rutgers University, provides an alphabetic listing of grammar and word choice issues. Lynch offers this consoling take on the difference between that and which.
“Many of the best writers in the language couldn't tell you the difference between them, while many of the worst think they know. If the subtle difference between the two confuses you, use whatever sounds right. Other matters are more worthy of your attention.” He then offers a clear and pithy explanation of the difference.
The University of Ottawa
An online grammar course that covers the parts of speech, punctuation, pronouns, verbs, modifiers, clauses, sentences and spelling. This course lets you brush up on English grammar in the privacy of your office or cubicle.
The Ultimate Style Guide Resources for MLA, APA, Chicago, and CSE
A list of good Internet style guide links. If The Chicago Manual of Style is your style bible, you’ll love the CMS Crib Sheet that summarizes the manual’s most important topics and rules.
School House Rock
And finally, if you need a break from the rigors of correct usage, head over to Grammar Rock for animated music videos that teach the rules and make you smile. Busy Prepositions makes sense of the confusing rules for prepositions. You’ll spend the day humming the tune (guaranteed!).