2.Nf3 has been considered theoretically best for about the past 100 years.
after 1e4 e5?

Check out "Improve Your Opening Play" (Ward) or "The Ideas Behind the Chess Openings" (Fine) and you'll get an idea what are the basic goals for each side and what sort of play each move leads to. Then you'll know what's best for you.
lance > 2.Nf3 has been considered theoretically best for about the past 100 years.
2.Nf3 is the solid option. 2.d4 and 2.f4 are more ambitious (and risky).

ok I'm sure that after 1e4 e5 2NF3 Has been considéred theoretically best for about the past 100 years.
realy i want to expose this position and i want your idea about it
13...Rc8 doesn't seem to do much as the c file doesn't look like it will open in the future.
13..Be6 can be met with 14.cxd5, Bxf4 15.dxc6, bxd6 when black has double isolated c pawns. Black has the bishop pair, but white traided his bad dark bishop, and has a great outpost for his knight on d5.
13...Bd6 seems a little passive.
I think 13...Bd4 looks more active than Bd6, but white has a handfull of good moves to chose from: Rb1, Re1, cxd5, Be3, Qb3 and even Ne2 seems ok for white.

2.Nf3 has been considered theoretically best for about the past 100 years.
To be blunt that's completely and utterly wrong. None is "best" It's all about style and preference.

2.Nf3 has been considered theoretically best for about the past 100 years.
To be blunt that's completely and utterly wrong. None is "best" It's all about style and preference.
According to opening explorer Nf3 is best. This is only statistical, but I believe stats do often strongly suggest what is best given a large enough sample. Of course knowledge of the Vienna or King Gambit by white, assuming black is fairly ignorant might warrant these openings be played. The trouble is, say you are a very talented player, you are setting an upper limit on your strength because you will sooner or later meet someone over whom you would need a more objective opening to secure the full point. Of course for the average Joe it's unlikely you would become strong enough to get to the point where 1e4 e5 2Nc3 say, was hitting the objectivity buffers.
Anyway, you might feel different in six or seven years about it !
after 1e4 e5 is the best 2Nf3 or 2f4 or 2d4 ?