Blogs are something I know a bit about since I started The English Blog in 2004, and have written well over 9,000 posts in that time! The original tagline for The English Blog was "Internet resources, reviews, news, tips and trivia for learners and teachers of English", and that is still a good description. However, there are other ESL blogs available, so here's a list of the best of the rest …
5-Minute Language — A collection of articles with language learning tips that take less than 5 minutes to read.
About Words — Cambridge Dictionary's blog for teachers and advanced learners.
Bell — Learning resources from the Bell School of English.
Bloomsbury News Blog — From the Bloomsbury International School in London.
English Blogs — Articles about English life and culture.
English with a Twist — The main focus is business English but more general topics are covered too.
Espresso English — Lots of free resources, grammar and vocabulary lessons from one of the best online ESL sites.
FluentU — Learning resources, tips, vocabulary and grammar from one of the best online language learning sites. I've linked to a number of their articles in this guide.
Idiomatic — Illustrated English idioms with definition, examples, and origin.
Learn Hot English Blog — Free lessons and articles.
Linguaplex Blog — English tips for intermediate and advanced speakers.
Macmillan Dictionary Blog — Categories include Word of the Day, Language Tips, and Videos
MyEnglishTeacher.eu — A colourful, fun blog with excellent articles on grammar, vocabulary, idioms, learning English.
Pearson English Blog — English Learning hints and tips.
PhraseMix — Plenty of good advice on how to learn a language.
Random Idea English — Lessons and exercises for advanced students.
Real Life English — Over 500,000 words (in 6 languages), 24 hours of audio learning material, and 5 hours of video lessons.
Rolls off the Tongue — Presents jokes and explains why they are funny, also looks at idioms.
The ABA Journal — An impressive collection of articles on Lifestyle & Culture, Everyday & Travel, Language & Study, and Business & Work.
ThoughtCo — Interesting articles and resources for ESL students and teachers.
Virelt — Viral videos for higher-level ELT with questions and listening activities.
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