... Fischer said, lesson one: play through all the variations, subvariations and notes in Modern Chess Openings. Lesson two: do it again. ...
"On being quizzed over chess lessons, Bobby Fischer advised ... Frank Brady, (tongue-in-cheek, I'm sure): 'For the first lesson, I want you to play over every column of Modern Chess Openings, including the footnotes. And for the next lesson, I want you to do it again.' ... opening encyclopaedias are an important part of chess literature, but I do wonder how I would have found the experience as a junior player of ploughing through the latest volume of intense opening theory. A bit bewildering perhaps?" - GM John Emms (2006)
I am 1600 + rated on chess.com and I want to reach 1700 on chess.com
Then you should spend more time finding really old threads and commenting on them.