How to win against the Sicilian?

You might want to look into anti-Sicilians, basically anything except the Open Sicilian lines. The Closed Sicilian is reasonably popular, and the Alapin is perfectly playable. A fascinating try is the Kopec System, characterized by the odd looking Bd3. The idea is to turn the Sicilian into more of a Ruy Lopez type structure.

It depends on the Sicilian line you're talking about. For example, the Maróczy Bind tends to be the best response to the accelerated dragon(which is what I play) and the Yugoslav attack tends to be good in the regular dragon.
Play 2 c4 and turn the opening into a Symmetrical English. Refer to the Botvinnik System in the English for more details.
You don't need to learn "tricks" against a particular opening, you need to study chess: middlegame and endgame strategy and lots of tactics. As long as you follow opening principles and get a playable position out of the opening, that's all you need at this point. Don't waste your time on the wrong things.

Just stack up pressure against the d-file if they're not playing the dragon. If they play the accelerated dragon play an early Nxc6 and they're out of book and there are a few traps you can use. If they play the regular dragon play f4 and go for the simple trap line.
Works for me about 25% of the time against 2200+ players, and if they don't fall for it it's even anyway
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A number of possibilities are discussed in:
Starting Out: The Sicilian by GM John Emms (2009)
https://web.archive.org/web/20140627122350/http://www.chesscafe.com/text/hansen123.pdf
Suggestions can be found in:
A Simple Chess Opening Repertoire for White by Sam Collins
http://www.gambitbooks.com/pdfs/A_Simple_Chess_Opening_Repertoire_for_White.pdf
My First Chess Opening Repertoire for White by Vincent Moret
https://www.newinchess.com/media/wysiwyg/product_pdf/9033.pdf
The King's Indian attack - Move by Move by GM Neil McDonald (2014)
https://www.newinchess.com/media/wysiwyg/product_pdf/7277.pdf
Starting Out: King's Indian Attack by John Emms (2005)
https://web.archive.org/web/20140627034051/http://www.chesscafe.com/text/hansen81.pdf
The Complete c3 Sicilian by Evgeny Sveshnikov (2010)
https://web.archive.org/web/20140626234618/http://www.chesscafe.com/text/hansen141.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/944.pdf
Starting Out: Closed Sicilian by Richard Palliser (2006)
https://web.archive.org/web/20140626175558/http://www.chesscafe.com/text/hansen87.pdf
The Closed Sicilian - Move by Move by FM Carsten Hansen (2017)
https://www.newinchess.com/media/wysiwyg/product_pdf/7715.pdf
The Grand Prix Attack by Evgeny Sveshnikov (2013)
https://web.archive.org/web/20140626232217/http://www.chesscafe.com/text/hansen171.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/979.pdf
Mayhem in the Morra by Marc Esserman (2012) https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
The Rossolimo Sicilian by Victor Bologan
https://web.archive.org/web/20140626195254/http://www.chesscafe.com/text/hansen147.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/952.pdf
Rossolimo and Friends by Alexei Kornev (2015)
http://gainesvillechesstraining.com/?page_id=393
https://www.newinchess.com/media/wysiwyg/product_pdf/7501.pdf
The Modern Anti-Sicilian: 1.e4 c5 2.a3 by Sergei Soloviov (2014)
https://www.newinchess.com/media/wysiwyg/product_pdf/7393.pdf
A Chess Opening Repertoire for Blitz and Rapid by Evgeny and Vladimir Sveshnikov
https://www.newinchess.com/media/wysiwyg/product_pdf/9020.pdf
Coming soon:
Playing 1.e4 - Sicilian & French by John Shaw
If you decide to go for the open Sicilian, you could look in:
Taming the Sicilian by Nigel Davies (2002)
https://web.archive.org/web/20140627033203/http://www.chesscafe.com/text/hansen46.pdf
Slay the Sicilian by Timothy Taylor (2012)
https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7080.pdf
Steamrolling the Sicilian by Sergey Kasparov (2013)
https://web.archive.org/web/20140627101148/http://www.chesscafe.com/text/hansen174.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/987.pdf
MODERNIZED: The Open Sicilian written by IM Zhanibek Amanov and FM Kostya Kavutskiy (2015)
http://claudiamunoz.com/index.php/en/chess-book-reviews/5430-my-book-review-modernized-the-open-sicilian
https://www.newinchess.com/media/wysiwyg/product_pdf/7500.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian I by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/Negi_1e4_vs_the_Sicilian_One-excerpt.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian II by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/GrandmasterRepertoire1e4vsSicilianII-excerpt.pdf
Grandmaster Repertoire - 1.e4 vs The Sicilian III by Parimarjan Negi
http://www.qualitychess.co.uk/ebooks/1e4vsSicilianIII-excerpt.pdf
Neil McDonald's Starting Out 1.e4
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf
http://www.theweekinchess.com/john-watson-reviews/opening-books-en-masse-part-3
The Chameleon Variation
https://static1.squarespace.com/static/5856bd64ff7c50433c3803db/t/59dd1b9e2278e7c9307e826c/1507662752754/cham_sic_excerpt.pdf
Sabotaging the Sicilian, French and Caro-Kann Defenses with 2.b3
https://static1.squarespace.com/static/5856bd64ff7c50433c3803db/t/5a297ea4e4966b8324237790/1512668837756/sabotage_excerpt.pdf
Hello everyone. 2 yrs back, I was an e4 player. But, whenever someone used the Sicilian against me, I used to lose my games... so I switched to d4.... but I wanna explore different openings coz I cant keep playing d4 always.. so if u guys know any tricks or any repertoire against the sicilian.. do let me know... thanks in advance!!