See this solid setup of the black pieces above that gives Black a comfortable game, because the power of the white bishop-g2 is reduced by the black pawn structure d5,c6. You can say the white bishop bites on granite. Black should play h6 to be able to retreat with the bishop to h7, when it gets attacked. Black should start counterplay at the queenside.

When you have started with 1.e4 you just follow by d3, Nd2, Ngf3, g3, Bg2, and 0-0. Or just play a different move order and begin with 1.g3, 1.Nf3, or even 1. d3. This closed system is very flexible and is suitable for strategic players who prefer to accumulate small positional advantages over time.

But don't be mislead by its name as this opening is not necessarily an attack. Don't try to overrun your opponent as Black can reach a comfortable position easily and you cannot expect to have a small edge as White that you should have normally playing the white pieces.

This is the reason why the King's Indian Attack is usually not used at the highest chess level but is played more on the club level.

Furthermore the game will often evolve differently from that of a typical King's Indian Defence played by Black.

The set up is easy to learn but if you are a beginner and have no understanding of positional chess you should not play this positional opening but rather play open tactical-rich games starting with 1.e4 like the Italian Game or the Ruy Lopez (Spanish).

Here, a example,

Kozul, Zdenko  -  Burmakin, Vladimir    1/2-1/2

1. Nf3 d5 2. g3 c6 3. Bg2 Nf6 4. O-O Bg4 5. d3 Nbd7 6. Qe1 e5 7. e4 de4 8. de4 Bc59. Nbd2 O-O 10. Nc4 Qc7 11. a4 Rfe8 12. Ne3 Bf3 13. Bf3 g6 14. a5 Nf8 15. b4 Be716. c3 b5 17. ab6 ab6 18. Bd2 Qd7 19. Qe2 Red8 20. Ra8 Ra8 21. Rd1 b5 22. Ng4 Ng423. Bg4 Qa7 24. Bh6 Qa2 25. Qa2 Ra2 26. Be3 Ra3 27. Rc1 Ra8 28. h4 h5 29. Bh3 f630. c4 Bb4 31. cb5 cb5 32. Rb1 Ra4 33. Bf1 Be7 34. Rb5 Rb4 35. Ra5 Ne6 36. Ra6 Kf737. Rc6 Nd4 38. Rc8 Ke6 39. Kg2 Bd6 40. Bd3 Rb8 41. Rc1 Ke7 42. Kh3 Ke6 43. Rc3Rb7 44. Rc6 Rc7 45. Rc7 Bc7 46. Kg2 Ba5