What are the best websites like khanacademy.org where you can learn English grammar for free?

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Artur Sergyeyev

There is plenty of such web sites. For video lessons see e.g. https://www.youtube.com/channel/UCicjynhfFw2LiIQFnoS1JTw .

Some links to the lessons in the classical format are given below:

http://www.learn-english-today.com/lessons/lessons_list.html

http://www.englishgrammar.org/lessons/

http://englishgrammar101.com/