Why does the computer analyze this position as +2 (white is much better)?

Stockfish evaluates the following position as +2: lichess.org/analysis/r3k2r/p1qnnpp1/2p1p3/1pPpP2p/1P1P3P/3Q1N2/P2N1PP1/RR4K1_w_kq_-

I do not understand why white has an such a big advantage in the position. The position is closed, so white doesn't have any immediate attacking points. I don't think black's king in the center is in any danger. The only thing I see that white could have an advantage with is the slight space advantage white has. But then it seems like a very slight advantage, and I have no idea how I'd win as white in this position. I tried starting from this position, and playing the move Stockfish recommends until the game ends. Sure enough, white wins, but I don't understand the moves at all. Can anybody help explain for me?

Note: The above position came from me considering what would happen if the following game went 15. Rfb1 b5. lichess.org/0yOaQawSd1lS

I followed through the Stockfish moves and don't understand the reasoning behind half of them either.

Though, a buddy at work and I sat here and worked through 2 or 3 ways to attack black from that starting position, all of which started with: a4. From there, no matter what Black does, the A file is opened, and possibly the a6-f1 diagonal as well, giving the White Queen access. I'm sure I've missed something, since I'm still a beginner, but it seems to me that it would give White a sizeable positional advantage, or pressure Black into making a blunder.

Yes white plays a4. The white advantage comes from the active white rooks, while black's rooks are not connected. Black has not castled, and cannot castle safely because he has moved ...h5: white would play Ng5.

Thank you. It makes more sense now. I have considered opening up the a file, but I didn't realize that the h8 rook is out of the game. I had assumed that the issue with the h5 pawn could be solved by just playing g6. But after playing some lines as black against the computer, I realized that playing g6 allows the white queen to enter at h6 in many lines. I also realized that the d7 knight doesn't have a good place to be.

The idea for winning as white seems to be "keep hitting the a file, b5, f7, and h6, until one of them falls." Here are some lines I played as black against the computer. (Copy and paste these into the "PGN" box of the analysis board.)

Line 1:

[Variant "From Position"]
[FEN "r3k2r/p1qnnpp1/2p1p3/1pPpP2p/1P1P3P/3Q1N2/P2N1PP1/RR4K1 w kq -"]

1. a4 Qb7 2. Nf1 g6 3. axb5 cxb5 4. Ng3 Nc6
5. Ra3 O-O-O 6. Qd2 Kb8 7. Ng5 Nf8 8. Ne2 Nh7
9. Nf3 Ka8 10. Rba1 Rb8 11. Nc3 Rhc8 12. Ra6 Qc7
13. Qe2 Nxb4 14. Rxa7+ Qxa7 15. Rxa7+ Kxa7 16. Nxb5+ Kb7
17. Nd6+ Kc7 18. Nxc8 Kxc8 19. Qe3 Nf8 20. Qh6 Kd7
21. Qg7 Ke8 22. Ng5 Rb7 23. Qg8 Nc6 24. Nh7

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Line 2:

[Variant "From Position"]
[FEN "r3k2r/p1qnnpp1/2p1p3/1pPpP2p/1P1P3P/3Q1N2/P2N1PP1/RR4K1 w kq -"]

1. a4 Qb7 2. Nf1 g6 3. axb5 cxb5 4. Ng3 Nc6
5. Ra3 Nf8 6. Qd2 Rb8 7. Qf4 Nh7 8. Qh6 Kd7
9. Nd2 Rbf8 10. Qf4 Ke7 11. Rba1 Ra8 12. Nb3 Qc7
13. Na5 a6 14. Nxc6+ Qxc6 15. Rf3 Raf8 16. Ne2 Rhg8
17. Qh6 Rh8 18. Rfa3 Ra8 19. Nf4 Ke8 20. Qg7