Bruce Pandolfini wrote books for people learning the game. Google his name and you will find many titles.
can I get a list of chess books for my lvl pls
This, and the 5 other books in the same series
http://www.amazon.com/Play-Winning-Chess-Everyman/dp/1857443314

lol I guess you mean 900. Well, you should definitely focus on tactics. Learn the basic mates and study combinations and tactical patterns. Any tactics book is good for that. Here you can check out all basic mating patterns:
https://www.chess.com/forum/view/more-puzzles/basic-mating-patterns

here some combinations for you, tactics are the easiest way to improve:
https://www.chess.com/forum/view/more-puzzles/become-a-combinator
Possibly helpful:
Simple Attacking Plans by Fred Wilson (2012)
https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
Logical Chess: Move by Move by Irving Chernev (1957)
https://web.archive.org/web/20140708104437/http://www.chesscafe.com/text/logichess.pdf
The Most Instructive Games of Chess Ever Played by Irving Chernev
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Winning Chess by Irving Chernev and Fred Reinfeld (1949)
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf
Discovering Chess Openings by GM Johm Emms (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
Openings for Amateurs by Pete Tamburro (2014)
http://kenilworthian.blogspot.com/2014/05/review-of-pete-tamburros-openings-for.html
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
A Guide to Chess Improvement by Dan Heisman (2010)
https://web.archive.org/web/20140708105628/http://www.chesscafe.com/text/review781.pdf
Pl