I understand that the Old Benoni Defense is not the best thing to play if you want to enter a Benoni, because it's better to wait until white occupies C4 with a pawn, that way white can't really occupy C4 with the other knight later on, but what is the best way to enter a Benoni? is it e6 or c5 on move two for black? I am really interested in this opening because I am a King's Indian Defense player against d4, but the King's Indian Defense can be really stressful sometimes, so I am not always in the mood for it. The Benoni seems like another fun opening that imbalances the position and gives black a good fighting chance. I really like the move e6 on move two, because it gives you the flexibility of going into a Nimzo-Indian Defense if white plays knight C3 on move 3.
As you mentioned, the old benoni is garbage. You do need to wait for 2.c4.
That said, the Modern benoni has some major problems for Black. The biggest one is the Taimanov variation, also known as the Flick-Knife Attack.
1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+!
Because of this problem, most GMs don't play the Modern Benoni in its purest form. What they do instead is the following, but it requires you to know two openings:
1.d4 Nf6 2.c4 e6 and now:
A) If 3.g3, Instead of 3...d5, which would lead to the Catalan, you play 3...c5, leading to the Fianchetto Benoni, a line of the Modern Benoni.
B) If 3.Nf3, then 3...c5! After 4.d5 exd5 5.cxd5 d6 6.Nc3, you are once again in a Modern Benoni, but because White played Nf3, the Flick Knife Attack is no longer possible. This is the crux of the reason why GMs play 2...e6.
C) If 3.Nc3, you DO NOT play 3...c5 because you are back in the same predicament after 4.d5 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+! So instead, after 3.Nc3, you abandon the Benoni all together, and play 3...Bb4, the Nimzo-Indian. In essence, you would be converting to being a Nimzo-Indian player, but instead of answering the Sidelines with the Main Line Catalan, QGD, Bogo-Indian, or Queen's Indian, you are answering all of them with the Benoni.
So basically it is Nimzo-Indian against 3.Nc3, Modern Benoni against everything else on move 3.
I understand that the Old Benoni Defense is not the best thing to play if you want to enter a Benoni, because it's better to wait until white occupies C4 with a pawn, that way white can't really occupy C4 with the other knight later on, but what is the best way to enter a Benoni? is it e6 or c5 on move two for black? I am really interested in this opening because I am a King's Indian Defense player against d4, but the King's Indian Defense can be really stressful sometimes, so I am not always in the mood for it. The Benoni seems like another fun opening that imbalances the position and gives black a good fighting chance. I really like the move e6 on move two, because it gives you the flexibility of going into a Nimzo-Indian Defense if white plays knight C3 on move 3.