There are several excellent free websites where you can learn English. Here are some of the best options:

Duolingo : Duolingo offers interactive lessons in English (and many other languages) that cover vocabulary, grammar, listening, and speaking. It's user-friendly and suitable for beginners to intermediate learners.

BBC Learning English : BBC Learning English provides a wide range of resources , including articles, videos, audio programs, and interactive exercises. They cover various topics and language skills, making it suitable for learners of all levels.

EnglishClub : EnglishClub offers comprehensive lessons, grammar explanations, vocabulary lists, quizzes, and forums for learners of English. It's a great resource for self-study and includes materials for all proficiency levels.

ESL Library : ESL Library offers a collection of lesson plans, worksheets, and activities for English learners. While some materials require a subscription, they also provide free sample lessons and resources.

USA Learns : USA Learns offers free online courses for adults to improve their English speaking, listening, reading, and writing skills. The courses are designed to be engaging and interactive.

ManyThings.org : ManyThings.org provides a variety of games, quizzes, and exercises to practice English vocabulary, grammar, and pronunciation. It's a fun and informal way to supplement your learning.

British Council LearnEnglish : British Council LearnEnglish offers free resources for learners of English, including videos, games, podcasts, and interactive activities. They cover a wide range of topics and language skills.

Memrise : Memrise uses spaced repetition and mnemonic techniques to help learners memorize vocabulary and phrases. It offers in English for speakers of other languages ​​​​and is suitable for all levels.

These websites offer a wealth of resources to help you improve your English skills, whether you're a beginner or more advanced learner. Explore different sites to find the ones that best suit your learning style and goals.