How can I Improve my chess?

I'm good at chess, but I want to improve. Are there any useful tips for me?

Hang from you knees, let the blood rush to your head
Annotate games upside down with an astronaut pen

Or something like this:

https://www.amazon.com/Back-Basics-Tactics-ChessCafe-Chess/dp/1888690348

According to this guy you have a lot of time to spare:

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 (1949)
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
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
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
https://web.archive.org/web/20140708092617/http://www.chesscafe.com/text/review560.pdf
https://www.chess.com/article/view/book-review-winning-chess-endings
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
http://www.nystar.com/tamarkin/review1.htm

https://www.chess.com/article/view/study-plan-directory

There. Done. That's literally everything you need for years. But more realistically (Everyone gets bored with the same resource after a while) That link of resources, plus a few books, and some playing and analyzing, will be all you need for two years. 

Thanks, I'll try to find more websites and I'll see the link you put.

That link is a node that branches out to dozens, in not more than a hundred great resources right here on the site. Videos, Lectures, Books, study plans. It's crazy. We don't know how good you are yet, so that has something for everyone. Just pick the level of study you are comfortable with and BOOM, you're golden. 

Good Chess Books for Beginners and Beyond...

https://www.chess.com/forum/view/chess-equipment/good-chess-books-for-beginners-and-beyond

Let me, dear OP, give you an advice somehow "out of the box":

Read History of chess, and History of chess champions! What's the point? Well, it is likely to inspire you and motivate you, and make you want to know more about the great deeds and achievements, and make you want to read the games (with or without comments) that usually are inserted in the stories.

You, me, all need SPIRIT if we want to be able to go through the tedious hassle of chess studying and actually improve out of it.

An other tip: Regularity in chess studying prevails over quantity. As in: it brings more to study one hour chess EVERY day, than studying 3 hours on Sunday, then 4 hours on next Saturday. How so? It's a matter of synapses. Synapses are the links that our brain generates in order to connect our neurones to each other. And those synapses turn "permanent", only if the brain think "it's worth it". The "worth it" permanent synapses creation can also be achieved by intense emotions, which you can get from OTB official competition games.

As others stated, I don't know where you stand atm, and I don't know what your goals are. But if you want what you asked for, a solid psychological ground is a good idea, trust me on that!

lol the fosterbeer counter gambit 

 It reminds me how I so totally lose my sense of humour when someone plays such... thing to me OTB.

Last round of an open, a 2186 (or was it 2168?) plays me 1.Nc3... How many question marks have you got in your pocket? Put them all right next to this move.

So, I coldly, methodically, refutated his so stupid opening, cos it's stupid to assume a club chess player rated 2000 and above, won't know why it's wrong to play such move in the opening. And it pisses me off big time to be taken for an idiot just cos I've lost a couple of games against what 1500 and 1600 in the beginning of the tournament, because my head was elsewhere. You play me? Don't piss me off, friendly advice.

Funnily enough, my poor opponent, after resigning, complained to me: "But you played whatever!". And I replied sternly: "Dude, you play whatever to me, I reply whatever to you."

I'll post that game in my blog some day

 I'll provide still an explaination, without going into the details, of why 1.Nc3 is a very stupid move, perhaps even more stupid than 1.a3 or 1.h3:

I don't play Queen's pawn openings with white, and I don't play 1...-d5 in response to 1.d4. Still, I played the Caro-Kahn for a while, and have read with avidity what are the core ideas of the different opening groups. And if you do that, you'll stumble upon that one line: 1.d4-d5 2.Nc3? where any IM will explain to you: "But wtf do you think your knight is doing here? Do you see any perspective, any future for it?" (Quoting freely IM Vareille, don't tell him please, It'd be embarrasing to me).

So, you guess I replied to 1.Nc3? with the sound 1...-d5! and now the punk is YOU!

Thanks!

Thanks. I've checked out the links and they are pretty good.