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English grammar quizzes, tests, and exercises
Grammar Monster
www.grammar-monster.com
A fun collection of all the tricky points of grammar, including tests and exercises.
Perfect English Grammar
perfect-english-grammar.com
Specialist writing guides
Blogging: Writing Better Blog Posts
blogging.com/blog/how-to-write-good-blog-post/
Detailed guide to blogging written for blogging.com by a professional blogger.
Words we commonly misspell, spelling guides
A Study of Some of the Most Commonly Misspelled Words
barnsdle.demon.co.uk/spell/error.html
A well-researched and revealing study by Cornell Kimball of the words that are most commonly misspelled. And the winner is…minuscule.
The Free Dictionary Spelling Center
spellingcenter.com
Wikipedia: List of common misspellings in English
en.wikipedia.org/wiki/List_of_common_misspellings_in_English
yourDictionary.com 100 most often misspelled words
grammar.yourdictionary.com/spelling-and-word-lists/misspelled.html
English grammar and style guides
Common Errors in English
brians.wsu.edu/common-errors/
A very popular web site based on the book Common Errors in English Usage by Professor Paul Brians.
The Elements of Style by William Strunk, Jr.
bartelby.com/141/index.html
An online reproduction of the original (1918) book that was later revised (in 1957) by E B White. The revised version, now in its fourth edition, is easily and rightfully the most popular book on English style ever published.
Plain English guides
Plain English Guide
www.plainenglish.co.uk
British Plain English Campaign web site featuring a range of useful plain English guides.
Plain Language
www.plainlanguage.gov
US Government web site featuring a comprehensive Plain English handbook that can be viewed online or downloaded as a pdf file.
English dictionaries and thesauri
Cambridge Dictionary
dictionary.cambridge.org/dictionary/english/
British English dictionary.
Dictionary.com and Thesaurus.com
dictionary.com and thesaurus.com
These companion sites are the most popular online dictionary and thesaurus, and include definitions, spellings, audio pronunciations, example sentences, and word origins. Dictionary.com’s main source is the Random House Unabridged Dictionary, supplemented numerous sources including American Heritage and Harper Collins.
Merriam-Webster
merriam-webster.com
Dictionary and thesaurus.
The Free Dictionary
thefreedictionary.com
Illustrated dictionary and thesaurus with convenient links to Wikipedia entries. Lots of great content including word and grammar quizzes.
Glossaries of grammatical terms
Daily Grammar
www.dailygrammar.com/glossary.html
Glossary and free grammar lessions
Grammar Monster
www.grammar-monster.com/grammar_terms_and_definitions.htm
UsingEnglish.com
www.usingenglish.com/glossary/
British English versus American English
Wikipedia: American and British English differences
en.wikipedia.org/wiki/American_and_British_English_Differences