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Is the sicilian opening good for beginners like me ?

The Sicilian is huge; one of the largest theory bodies for sure. It's divided in many according to the pawn structures that arise, and you usually play one of those, but not all of them. Nothing stops you from trying it, but other stuff is more accessible if you're a beginner. If you pick the Slav and Caro-Kann you have stuff against d4 and e4, and they're similar to each other too, which is a good thing to have.
How many times have you asked? Trying to give everyone the benefit of the doubt they are not trying to bait people is hard. I need to refrain from coming here. Though if you are really new I would play a few games to get the feel. Maybe try Pirc of Caro-Kann for a bit. Avoid the French and Alekhine's unless you want to have fun. Chances are your opponent doesn't know all the theory against the Alekhine's. The French suffocates the Queen's Bishop too much for Magnus to use consistently.
If your goal is learning experience, possibly at the expense of short term results, Sicilian, in particular its open variants, can be the right choice (for white, probably something like Scotch or Spanish (Ruy Lopez)). On the other hand, if you rather want to win as much as possible right now (especially in short time controls) and don't care about future progress, some less known [ct]rappy opening would be way more efficient. Many people also choose seemingly quiet opening like Caro-Kann or Pirc in the hope that they will allow them to avoid early confrontation but even those have variants that can get pretty sharp (and rough).
When I was first getting into tournament chess, I was immediately attracted to the Sicilian. Right from the first move, black plays asymmetrically, thus challenges white's initiative. Half a century later, my opening repertoire has expanded quite a bit, but the Sicilian still fits exactly that role.
@mkubecek is quite correct. This can be a difficult but fruitful way to gain useful experience.
The thing about Sicilian is, that most of the players who play sicilian only knows how to play when white plays 2.Nf3 ...

I use 2.c3 (alapin) against sicilian players, and most common responses fron my opponent when I play alapin are, 2...Ne6 and 2...d6 (which are not the best, you should play d5 or nf6 against alapin)

So if you want to study sicilian, learn all the responses from white, not only open sicilian, or I don't really recommend it
Perhaps the primary mistake is trying to think of Sicilian as one opening, it's rather a class of openings which can differ quite a lot.
(Calling it "Sicilian defense" may be seen as another mistake. :-) )
As you can imagine from @Acrobat31 and @mkubecek replies, the main problem with Sicilian is you allow White to pick from many very different variations and the good moves are sometimes non-intuitive (e. g. 1.e4 c5 2.c3 d6 looked fine but it is not!), so better you learn at least 5-6 lines.

On the other hand, you will be learning a lot and having fun (probably not in the same game) so it is definitely worth a try, even if you later switch to another opening.
"... For players with very limited experience, ... the Sicilian Defence ... normally leaves you with little room to manoeuvre and is best left until your positional skills develop. ... I'm still not excited about my students playing the Sicilian Defence at [the stage where they have a moderate level of experience and some opening competence], because it almost always means playing with less space and development, and in some cases with exotic and not particularly instructive pawn-structures. ... if you're taking the Sicilian up at [say, 1700 Elo and above], you should put in a lot of serious study time, as well as commit to playing it for a few years. ..." - IM John Watson (2010)