Helpful resources for learning English grammar include grammar blogs, books and online guides and courses. For students learning English as a foreign language, websites such as English4u and the ESL Resource Center are recommended. These offer learners free lessons, guides, quizzes and exercises, among other resources.
There are also many websites intended to improve the grammar skills of native speakers, such as Writing at Its Best, which provides grammar resources for writers and other English language professionals.
Some recommended English grammar blogs are Grammar Girl's Quick and Dirty Tips for Better Writing and the Grammar Cop Blog. Grammar Girl has been praised for her simplification of English grammar, as well as her tips and memory tricks for keeping grammatical rules in mind. Many other blogs focus on the grammatically correct usage of specific elements of writing, such as commas, quotation marks, apostrophes and the word "literally."
Books are another useful resource for improving English grammar. Some recommended titles are Jack W. Lynch's "The Lexicographer's Dilemma: The Evolution of 'Proper' English, From Shakespeare to South Park" and "A Dictionary of Modern English Usage" by H.W. Fowler and David Crystal. In "The Lexicographer's Dilemma," Lynch details common grammatical errors, such as the split infinitive, and traces their origin.