It’s been ~25 years since I formally studied English language (as part of academic curriculum) and read through Wren and Martin grammar book.
Since then I have read lots and lots of books in English, but mainly related to the area or topic of interest. For example, Murder mystery, Humour, Management books, Novels etc. And I looked up dictionary or grammar books from time to time as and when required.
What I realised was that this mode of learning was actually better and engaging. When you learn something for exams it’s very boring. When you do it for not writing exams but for some other end goal it’s fun!
So I keep on collecting such information and material. Here is one such piece I found on Twitter.