I would love to improve... So I need your advices. ; )
I accidentally added this thread unfinished... OMG.
I know that for 90% for you I am still just a noob, weak player and you could easily defeat me. But for me this is just a dream. Basically I gained 500 rating points in a month. I want to buy a chessboard soon and also some book(s). And I would like you to recommend me a book or two. Beacause I don't know which to buy. I don't know how to improve. I don't know what to do. Thanks for reading this and sorry for this mess but I'm new here and I accidentally added this thread before finishing. Please don't ban me. I'm sorry. Thanks.
Possibly of interest:
Simple Attacking Plans by Fred Wilson (2012)https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
http://dev.jeremysilman.com/shop/pc/Simple-Attacking-Plans-77p3731.htm
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 (1965)
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Winning Chess by Irving Chernev and Fred Reinfeld (1948)
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf
Back to Basics: Tactics by Dan Heisman (2007)
https://web.archive.org/web/20140708233537/http://www.chesscafe.com/text/review585.pdf
https://www.chess.com/article/view/book-review-back-to-basics-tactics
Discovering Chess Openings by GM John 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
https://chessbookreviews.wordpress.com/tag/openings-for-amateurs/
https://www.mongoosepress.com/catalog/excerpts/openings_amateurs.pdf
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
A Guide to Chess Improvement by Dan Heisman (2010)
https://web.archive.org/web/20140708105628/http://www.chesscafe.com/text/review781.pdf
Studying Chess Made Easy by Andrew Soltis (2009)
https://web.archive.org/web/20140708090448/http://www.chesscafe.com/text/review750.pdf
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
http://www.nystar.com/tamarkin/review1.htm
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
https://www.chess.com/article/view/book-review-winning-chess-endings
https://web.archive.org/web/20140708092617/http://www.chesscafe.com/text/review560.pdf
Opening Principles:
1. Control the center squares – d4-e4-d5-e5
2. Develop your minor pieces toward the center – piece activity is the key
3. Castle
4. Connect your rooks
Tactics...tactics...tactics...
Pre Move Checklist:
1. Make sure all your pieces are safe.
2. Look for forcing move: Checks, captures, threats. You want to look at ALL forcing moves (even the bad ones) this will force you look at, and see the entire board.
3. If there are no forcing moves, you then want to remove any of your opponent’s pieces from your side of the board.
4. If your opponent doesn’t have any of his pieces on your side of the board, then you want to improve the position of your least active piece.
5. After each move by your opponent, ask yourself: "What is my opponent trying to do?"
As a beginner, your best bet is to 1) review books that have lots of verbal commentary, so you can digest the basic chess rules, and 2) learn and study the basic tactical patterns. Any tactical book can help, especially one aimed at beginners, and there are many free resources online.
I would suggest the 'Winning Chess' series by Yasser Seirawan and/or 'Logical Chess Move by Move' by Chernov. Both are considered classics, both were among the first chess books many players have started with, and both will help you. Seirawan's stuff is more modern, but may be more expensive; Chernov's book can be found second-hand relatively easily as far as chess books go.
"Basically I gained 500 rating points in a month."
That's dynomyte!!!
Complete Chess Course by Reinfeld
https://www.newinchess.com/media/wysiwyg/product_pdf/3706.pdf
Masters of the Chessboard by Richard Reti
http://www.thechessmind.net/blog/2012/4/1/book-notice-richard-retis-masters-of-the-chessboard.html
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
https://www.chess.com/article/view/book-review-winning-chess-endings
Back to Basics: Tactics by Dan Heisman (2007)
https://web.archive.org/web/20140708233537/http://www.chesscafe.com/text/review585.pdf
https://www.chess.com/article/view/book-review-back-to-basics-tactics
Gaining 500 points is great - regardless of where you started. This is by all means a great start! Wanting to improve: coming to "forums", you came to the right place (I won't ban you, and you should not worry) 
You will get some good advice here. One of the best advices I can give (to any level player) is to enjoy Chess, and learn from your mistakes, and you will improve.If you want more specific advice, I'd be glad to give some thoughts via messages - but it will likely take a while to first develop into what kind of a Chess player you are before " specifics" will help. Specific advice may help later on, but right now " basics" will be most helpful. Develop your pieces first, castle earlier than later, and learn "basics" like this (although when you improve, you will find that there are exceptions to almost every "Chess principle"). Just have fun playing Chess. Best of luck with your Chess/improving 
Oh, thank you so much. This is so helpful, I will check all of these books and buy some of them now, some of them later. I want to learn more form paper so I don't need to spend a lot of time in front of laptop or phone.
That 500 rating boost is basically 200 from starting position (from 800 to 1008) but I dropped to 500 right after the start so I include this. I watch chess streams, game analysis and do as many things to improve as I can but I needed advice from experienced players because you know what to do and I don't.
Thank you very, very much for every answer and every tip and all good wishes. Have a nice day.