At your rating of about 1300, training tactics will yield the greatest improvement. There is a tool on chess.com called 'puzzles' which is the same thing.
How do you "Study Chess"?
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"... for those that want to be as good as they can be, they'll have to work hard.
Play opponents who are better than you … Learn basic endgames. Create a simple opening repertoire (understanding the moves are far more important than memorizing them). Study tactics. And pick up tons of patterns. That’s the drumbeat of success. ..." - IM Jeremy Silman (December 27, 2018)
https://www.chess.com/article/view/little-things-that-help-your-game
https://www.chess.com/forum/view/game-showcase/post-your-best-miniatures-here