Study the topics listed at the very beginning of the following article...i.e., opening principles, tactics, endgame, and finally positional concepts and techniques of chess...
Good Chess Books for Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond
get a tactics book
either physical copy or an online resource book that is geared for “beginner tactics” (dont be swayed by “beginner” in chess- many “beginner” books are useful for players into class a territory)
start working on the chess puzzles in the tactics book
familiarize yourself with john bartholomew’s “chess fundamentals” and “climbing the ratings ladder” series on youtube
start playing games (at the absolute least at 15/10 and better yet 30 min and even better than that- otb tournament games at classical time controls)
after a game it is important to go over your game, move by move, note any feelings, ideas, fears/worries, etc.
try to realize critical moments in the game and where a game was either won or lost
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because i use chess.com app i needed an ios database app to allow me to copy my online games and paste them into the database app where i can make all the notes, annotations, and variants (getting this really helped in itself because i could organize games by “white” “black” “wins” losses” - whatever)
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after going through the game like this i would go over it again with the software’s chess engine turned on; doing this after my first analysis keeps me from being influenced by engine as i make annotations and variants; the second analysis with engine allows me to blunder check (you will know a blunder happens when the “strength meter” makes a sudden jump of, usually, +/-2.0 or more (the two representing material worth two pawns)
after seeing a blunder then scroll back and see how the circumstances arose that led to blunder and how play afterwards was affected (many times both players will miss a blunder and not be affected by it)
really try to understand the what, where, why, and how of these blunders
after all of this you could play another game though quality is much better than quantity
try this for awhile and see where you are after a few months
***(when i started it was the post game analysis that really provided the most benefit)
****chess.coms tactics are ok but if you really want to get most bang for your buck a good tactics book with really good puzzles going over the motifs and themes and gradually becoming more complex really helped me more