How To Beat The Sicilian ?

Whob,
So what you are saying is you play the Morra and hope Black doesn't know how to play the opening he selected?

Beating a Sicilian is best done with Iocane powder.
Lol, I wonder how many people get that reference.

I suggest a closed version of the Sicilian starting with 1e4 c5 2 N-c3 any usually and then 3 f4. Often I finchetto my king's bishop.
A lot of the open Sicilian lines require a lot of theory. This way, the game is a slower positional contest, which usually works out better for me. I have also tried 1e4c5 2N-c3N-c6 3B-b5 (which allows the bishop out with the intention of usually exchanging it. Black can try and avoid that by playing N-d4, but thses lines are acceptable for white.

Oh, that does fall under the Grand Prix attack, though I usually play it differently than some of the book lines.
In Starting Out: The Sicilian, GM John Emms introduces a lot of possibilities.
https://web.archive.org/web/20140627122350/http://www.chesscafe.com/text/hansen123.pdf
Suggestions can be found in:
Chris Baker's A Startling Chess Opening Repertoire
http://www.theweekinchess.com/john-watson-reviews/more-nco-gambits-and-repertoires
John Emms's Attacking with 1.e4
https://web.archive.org/web/20140627003909/http://www.chesscafe.com/text/hansen29.pdf
http://www.theweekinchess.com/john-watson-reviews/one-book-repertoires-online-bargain
Kaufman's original repertoire book, The Chess Advantage in Black and White
https://web.archive.org/web/20140626223458/http://www.chesscafe.com/text/hansen62.pdf
http://www.theweekinchess.com/john-watson-reviews/in-the-beginning-there-was-theory
Sam Collins's An Attacking Repertoire for White
https://web.archive.org/web/20140627122005/http://www.chesscafe.com/text/hansen66.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
Chess Openings for White, Explained by Alburt, Dzindzichashvili & Perelshteyn (2006)
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf
https://web.archive.org/web/20140626210017/http://www.chesscafe.com/text/hansen132.pdf
http://www.theweekinchess.com/john-watson-reviews/good...good...good...disastrous
The King's Indian attack - Move by Move by GM Neil McDonald (2014)
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
How to Beat the Sicilian Defence by Gawain Jones (2011)
https://web.archive.org/web/20140626195254/http://www.chesscafe.com/text/hansen147.pdf
Starting Out: Closed Sicilian by Richard Palliser (2006)
https://web.archive.org/web/20140626175558/http://www.chesscafe.com/text/hansen87.pdf
The Grand Prix Attack by Evgeny Sveshnikov (2013)
https://web.archive.org/web/20140626232217/http://www.chesscafe.com/text/hansen171.pdf
Mayhem in the Morra by Marc Esserman (2012) https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
Rossolimo and Friends by Alexei Kornev (2015)
http://gainesvillechesstraining.com/?page_id=393
The Modern Anti-Sicilian: 1.e4 c5 2.a3 by Sergei Soloviov (2014)
A Chess Opening Repertoire for Blitz and Rapid by Evgeny and Vladimir Sveshnikov
Taming the Sicilian by Nigel Davies (2002)
https://web.archive.org/web/20140627033203/http://www.chesscafe.com/text/hansen46.pdf
Experts vs. the Sicilian edited by Jacob Aagaard & John Shaw (2006)
https://web.archive.org/web/20140626225408/http://www.chesscafe.com/text/hansen71.pdf
Seven Ways to Smash the Sicilian by Yuri Lapshun & Nick Conticello (2009)
https://web.archive.org/web/20140627015506/http://www.chesscafe.com/text/hansen126.pdf
Dismantling the Sicilian by Jesus de la Villa (2009)
https://web.archive.org/web/20140627002658/http://www.chesscafe.com/text/hansen129.pdf
Sicilian Attacks by Yuri Yakovich (2010)
https://web.archive.org/web/20140627063241/http://www.chesscafe.com/text/hansen145.pdf
Slay the Sicilian by Timothy Taylor (2012)
https://web.archive.org/web/20140627043409/http://www.chesscafe.com/text/hansen160.pdf
Steamrolling the Sicilian by Sergey Kasparov (2013)
https://web.archive.org/web/20140627101148/http://www.chesscafe.com/text/hansen174.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
Grandmaster Repertoire - 1.e4 vs The Sicilian I by Parimarjan Negi
Grandmaster Repertoire - 1.e4 vs The Sicilian II by Parimarjan Negi
Coming soon:
Playing 1.e4 - Sicilian & French by John Shaw
A Simple Chess Opening Repertoire For White by Sam Collins
What would you recommend to a player so they can get an understanding of sicilian theory? Some players just don't understand the sicilian and need a decent book that explains the theory.....not just recommended lines that lead to disaster from not understanding the theory.

What would you recommend to a player so they can get an understanding of sicilian theory? Some players just don't understand the sicilian and need a decent book that explains the theory.....not just recommended lines that lead to disaster from not understanding the theory.
This is a great question . . . I figured if I repeated it, it will increase the chances of getting noticed ;-)
You have to try a lot of different ideas in blitz then analyze your games and see what works best for you. Then study that. Playing open sicilian as white is not that hard. You only need 1 line/variation. There are 2 basic, getting started, approaches. 1. Try something like the English attack that you can play against most lines and just play it till its wheels drop off. 2. If you know which variation they play, learn 1 super sharp, critical line against it, often one leading to perpetual check-tat sharp, and play that. You'll know it better than black and usually black will err somewhere and away you go. With both you try to win in the middlegame. Aggressive attacking chess is important for white in open Sicilians.

I wanna learn the open sicilian or 1.e4 c5 2. Nf3 Nc6 and then 3.Bb5 lines.It is considered by stockfish 13 as the best ways to defeat the sicilian.Sadly,there is no full tutorial in youtube and chess websites.Please help me.
There's plenty available on that -- it's called the Sicilian Rossolimo. When I googled it, the first hit was: https://www.youtube.com/watch?v=VSDX0DZh-08 ; I know that there's a video by Finegold on chess.com about it, too, in the category of anti-Sicilians
You have to try a lot of different ideas in blitz then analyze your games and see what works best for you. Then study that. Playing open sicilian as white is not that hard. You only need 1 line/variation. There are 2 basic, getting started, approaches. 1. Try something like the English attack that you can play against most lines and just play it till its wheels drop off. 2. If you know which variation they play, learn 1 super sharp, critical line against it, often one leading to perpetual check-tat sharp, and play that. You'll know it better than black and usually black will err somewhere and away you go. With both you try to win in the middlegame. Aggressive attacking chess is important for white in open Sicilians.
Uh,I want opening that can win in school tournaments(slow chess).
English attack works well fast or slow for white against many open Sicilians: Be3, f3 , Qd7, OOO & pawn storm on kingside. [I do find it useful to test my openings in blitz games. It's a lot more efficient to find you dont like a line in a 5 minute game so you can try something else in a 2 hour game.]