HOW CAN I WIN AGAINST THE ALAPIN

I have no idea, I just play random moves and I don't understand anything you're saying

The 2 main lines are 2...Nf6 and 2...d5.  When I did play the Taimanov and Najdorf briefly, I played the 2...Nf6 line.  The anti-Sicilians are a joke.  2.Nf3 and 3.d4 is why I quit the Sicilian totally.  I exclusively play 1...e6 against 1.e4 now.  It used to be my main response.  Now it is my only response.

I think this line with 5. ... Bf5 is reliable and easy to play as black: 1. e4 c5 2. c3 d5 3. exd Qxd5 4. d4 Nc6 5. Nf3 Bf5. The idea is that in some lines you play BxN on b1 before it can drive the queen away with Nc3.

There is no consensus way to deal with it, but the alapin gives both side chances through natural moves. Go with 2...d5 and after 3. exd5 Qxd5 4. d4 Nf6 5. Nf3, both sides will complete speedy development.

If you live in Los Angeles, get them in A LA PIN.

Alapin is solid so the way you win is to first equalize then outplay your opponent gradually. If you want a specific suggestion on what to play here are my notes:

1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nc6 5.Nf3 Bf5  {now there are 4 main options for white Be3-best-, Na3 intending Bc4 or Nb5-worst-, Be2 and dxc5 a standard Alapin idea} 6.Na3  {worst} 
( {other lines}  6.Be2 cxd4 7.cxd4 Bxb1  {This is the key move behind Bf5}  8.Rxb1 e6  {or Qxa2} {Black has some advantage here} )
( {a typical Alapin idea is to take and try to hold the pawn. It fails here if black is patient} 6.dxc5 Qxd1+ 7.Kxd1 O-O-O+ 8.Ke1 e5 9.Be3 Nf6 10.Nbd2 Nd5 11.Nb3 f6 12.Bb5 g5 13.h3  {Black has pressure in center and kingside and white cannot hold the extra pawn for much longer )
(6.Be3  {This is whites best move here. There are several sub-variation options so I will make a separate file for it} )
6...cxd4   7.Nb5  {If Bc4 then black plays Qe4+}  7...O-O-O 8.cxd4 e5  {with advantage to black} 9.Nc3 Qa5 10.d5 Nf6 11.Bc4 Nxd5 12.Bxd5 Bb4  {with a large advantage for black here} 

and, best for white,

1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nc6 5.Nf3 Bf5 6.Be3  {This is white's best reply here}  6...Nf6 7.Na3  {The Alapin ideas of Bc4 or Nb5} 
(7.Qa4  {This was recommended in one anti-Sicilian book. It leads to a slight plus for black}  7...cxd4 8.cxd4  {If Nxd4 the black plays  Bd7 and is fine} 8...e6  {another option is Bxb1}  9.Nc3 Bb4 10.Bb5 O-O  {and black is fine , maybe even slightly better} )
7...cxd4 8.Nxd4
(8.Bc4 Qa5 9.Nxd4 Nxd4 10.Bxd4 e5 11.Bb5+ Bd7 12.Bxd7+ Nxd7 13.Nc4 Qd5 14.Qe2 f6 15.O-O Be7 16.Rfe1 O-O  {this an equal , fighting position} )
(8.Nb5 O-O-O  {Now if 9. cxd then e5! is close to winning} 9.Nfxd4 Ng4  {a key move here}  10.Qe2 Nxe3 11.Qxe3 Nxd4 12.Nxd4 Bg6  {Completely equal} )
8...Nxd4 9.Qxd4 a6  {This is completely equal} 

I play 1...e6 and transpose to the Sicilian. However, I do like the ...d5 setup against the Alapin

All this took was using the Lichess Database. I recommend you check it out if you are having trouble with any openings. I didn't cover everything but you should get the main ideas down

What is your second move at the moment?

Black has a handful of solid replies against the Alapin that practically score a coin flip.

I go based on positions I understand and enjoy; which is b6/Katalimov.

I find the two most popular lines can get chaotic or complicated.

"HOW CAN I WIN AGAINST THE ALAPIN"
++ You cannot win as black against the Alapin unless white makes a mistake. Try not to lose first. 2 c3 blocks the move Nc3, so 2...d5 and 2...Nf6 are ways to exploit that.

The c3 Sicilian is hard. Besides established lines, it's most important that you learn to think ahead deeper and keep multiple possible lines in mind while playing. In the beginning, center play is most important. I always go for a Scheveningen-like setup and try to get the bishops active outside of the pawn cluster. This is one way of gaining activity.

Hi! It depens of the type of middle game your prefer. Normally 2...d5 can lead to IQP for white. 2...e6 can transpose easily to the Adavance French. I see some people adopting a king's fianchetto. And a not so common way of meeting the Alapin variation is .2...b6 that might transpose to the Owen defense. Las important variation is the Alekhine-like 2...Nf6. It's somewhat frustrating that none can have a similar taste as the open Sicilian -I mean it since I also play it.

Good luck!

The idea of 5...Bf5 after 3...Qxd5 if a new one to me, and at first sight didn't look that great, but several strong GM's playing it.

If play e6 sicilian's then 1.e4 c5 2c3 e6 3d4 d5 is another decent line 4pxp pxp is a french trarrasch type line, 4...Qxp is also good intending to play against isolated Queen pawn. Whilst 4e5 is an advanced french. Personally play e6 sicilians and the french so can use some side lines responses for both.

                     Prefer playing those to 1e4 c5 2.Nf3 e6 3c3 Nf6 4.e5 Nd5 and for example 5d4 pxp 6pxp d6 which has a good reputation for black too, but I am not particularly comfortable in resulting positions. 

I understand what you're saying! To me 5. ... Bg4 looks more natural but the variations there have been worked out to too many moves and I haven't been happy with some of its final positions. Bf5 is less worked out and seems easier to play (to me at least).

I play 4 knights as black and as a former French player I happily transpose into some of those lines but generally speaking I play for NF6 NC6 and in positions where I don't get to trade my c pawn and threated to pin the kings knight I play for D5.  So for me its business as usual 2e6.  Most common continuation for me is 3 NF3 Nc6 if they play D4 I play d5 then normally takes takes bb5 NF6.  The light squared bishop normally goes to blocks the rook on the open e file the dark bishop e7 or d6 depending on move order both side tend to castle kingside adn mvoe the rook to e file  etc very playable.   

Yeah, I like the Alapin as white. I don't like the unbalanced type Sicilian positions. 2. c3 leads to open positions more similar to what you get from 1.e4 e5, Caro-Kann, Alekhine's Defence or like Queen Gambit or Nimzo-Indian.

You see a lot in GM play where black is playing for a win and white for a draw, black will play the Sicilian and white the Alapin. Uusualy, black is the stronger player. However, in the knockout matches in the Generaltion Cup, Magnus was ahead 2-0 and needed a draw to win the match. He played the Alapin, exchanged queens early, and drew.

A lot of people are recommending 2...d5, which is blacks strongest response. Bringing the queen out this early can be uncomfortable, especially in territory your opponent likely knows better than you. I don't think playing the strongest, most critical line is necessary against the Alapin below IM level at least.

I suggest going with Nf6. This gets straight to the point, in the sense that c3 is occupying the square of the "opposing" knight, so white immediately has to address this. You'll see white e5 and d4 in almost all games. Black plays ...Nd5 which goes to b6 if threatened with Bc4, and I suggest "conceding" and taking with cxd4 (as opposed to insisting on leaving white with c3 blocking the knight) since c4 can be played with tempo now. Also, the inconvenience of c3 is already converted into another, the overextended e5. The undermining of this center is a clear plan for black going into the middlegame. Like Thrillerfan said, these lines really aren't your main concern with the sicilian.

Other lines for white after Nf6 are not really fighting for an advantage, so I think it's fair to say it would be a waste of time to study them on club level (or really any other tbh). Black should have equality by just playing sound, principled moves.

Playing this as white, I find that it often leads to wide open positions with a Sicilian style. That is, both side often have strong attacks. Whatever line, like 2.Nc3 or whatever, it tends to still be a Sicilian style position. Symetrical openings like e4e5 or d4d5 tend to be more drawish.

You are not playing the kan with correct move order.