This semester I started reading the materials from Cambidge Dictionary website. Until then I used it only to save new vocabulary. But it has another section I would like to talk about. The section of grammar - here you can find different topics divided into sections "Words, sentences and clauses", "Easily confused words", "Using English", etc.
Their articles are very often taken from the English Grammar Today, written by Ronald Carter, Michael McCarthy, Geraldine Mark, and Anne O’Keeffe. And I think, they are very well structured and easily understandable to everyone.
I find this important, because I want to get rid of my grammatical mistakes and I want to learn other grammatical forms. But I have to say, for future time I should do it more regularly. Nowadays I do it once in a while and not systematically.