Are you asking for the white or black side?
how to play for a win from the classical exchange french (3.nc3 nf6 4.exd5)

You could go for 5...Bg4, with the intention of ...Nc6, ...Qd7, and ...0-0-0 to create an imbalanced game. With the knight on c3 white is going to be slightly slower with the queenside attack so it actually seems like an improved version compared to this system in the normal exchange french

I will say that it is generally considered inadvisable for black (especially in a classical game) to actually castle queenside if white is well prepared after Nc6, Bd6, and Nge7 followed by Bf5. A well-timed c4 can often be extremely annoying. If you've found success with your repertoire, stick with it, but I highly recommend Anish Giri's chessable course where he discusses an early c5 move to imbalance the game, although you need to be comfortable with IQPs.

If you are comfortable with IQPs, I recommend h6 instead of c6 in this specific line, and after the bishop moves (presumably to d3), striking with c5 again, and the only line with leads to a small edge for white is to play Bb5+, which is fairly counterintuitive, considering you've just moved the bishop last move.

I will say that it is generally considered inadvisable for black (especially in a classical game) to actually castle queenside if white is well prepared after Nc6, Bd6, and Nge7 followed by Bf5. A well-timed c4 can often be extremely annoying. If you've found success with your repertoire, stick with it, but I highly recommend Anish Giri's chessable course where he discusses an early c5 move to imbalance the game, although you need to be comfortable with IQPs.
yeah but with the knight on c3, c4 is no longer an option, unless white spends another tempo to move it. this is why i said white's queenside attack is much slower compared to the regular french exchange. also Ne5 isn't really feasable due to the pin on f3 + Bd6 and Nc6 will stop Ne5.
obviously theres exceptions to every rule but i think generally it plays fine, and the engine seems to agree. (infact the engine finds it very easy to give black a small advantage after a few natural moves by white).

I will say that it is generally considered inadvisable for black (especially in a classical game) to actually castle queenside if white is well prepared after Nc6, Bd6, and Nge7 followed by Bf5. A well-timed c4 can often be extremely annoying. If you've found success with your repertoire, stick with it, but I highly recommend Anish Giri's chessable course where he discusses an early c5 move to imbalance the game, although you need to be comfortable with IQPs.
yeah but with the knight on c3, c4 is no longer an option, unless white spends another tempo to move it. this is why i said white's queenside attack is much slower compared to the regular french exchange. also Ne5 isn't really feasable due to the pin on f3 + Bd6 and Nc6 will stop Ne5.
obviously theres exceptions to every rule but i think generally it plays fine, and the engine seems to agree. (infact the engine finds it very easy to give black a small advantage after a few natural moves by white).
EWWWWWWWWWW

actually this line is promising
i much rather give the bishop pair for some structural damage or even having a good knight vs mediocre bishop than accept IQP as black.

I play what @Chess_Player_lol suggests, can completely crush your opponent if they aren't experienced in the position.

3.Nc3 Nf6 4.exd5 exd5 5.Nf3 Bb4 doesn't appeal to me- you just transpose to 3.Nc4 Bb4 4.exd5 etc which leaves white with some thin chances for a small advantage.
What's wrong with the natural 5...Bd6? You may also play ...c6 soon, but I don't think it is necessary unless white pins the f6 knight.

I will say that it is generally considered inadvisable for black (especially in a classical game) to actually castle queenside if white is well prepared after Nc6, Bd6, and Nge7 followed by Bf5. A well-timed c4 can often be extremely annoying. If you've found success with your repertoire, stick with it, but I highly recommend Anish Giri's chessable course where he discusses an early c5 move to imbalance the game, although you need to be comfortable with IQPs.
yeah but with the knight on c3, c4 is no longer an option, unless white spends another tempo to move it. this is why i said white's queenside attack is much slower compared to the regular french exchange. also Ne5 isn't really feasable due to the pin on f3 + Bd6 and Nc6 will stop Ne5.
obviously theres exceptions to every rule but i think generally it plays fine, and the engine seems to agree. (infact the engine finds it very easy to give black a small advantage after a few natural moves by white).
I thought Ne5 is a key idea in practically every line after h3 and g4...
So i have the regular french exchange down and i prefer the early nc6 variation (bf5, bd6, nge7, possible castle either side, probably f6 etc) for creating winning chances but i was wondering if there is any good bit of advice on creating counterplay after 1.e4 e6 2.d4 d5 3.nc3 nf6 4.exd5 exd5 5. nf3. for example, if black plays 5...c6, what kind of formation do you aim for? where is your key counterplay?