What should I play as black against d4, c4, and Nf3?

What do you play as Black against 1. e4?

How do you open as White?

Looks like he plays 1.e4 f6 as black.

https://www.chess.com/live/game/3703174048?username=kingofchessman

I think we need IMBacon to answer this one

Saying that White plays d4, c4, and Nf3 is bogus.  Both sides decide the opening, not one.

For example:

1.d4 d5 2.c4 e6 3.Nf3, 1.d4 Nf6 2.c4 e6 3.Nf3, 1.d4 Nf6 2.c4 c5 3.Nf3, and 1.d4 Nf6 2.c4 e6 3.Nf3 are all vastly different

After 1.d4 d5 2.c4 e6 3.Nf3, White's intention, 9 times out of 10, is to play the Catalan.  It is a very positional opening, and "aggressive" is not an option for Black unless he wants to die quickly!

After 1.d4 Nf6 2.c4 e6 3.Nf3, White is out to avoid the Nimzo-Indian.  This can lead to a Queen's Indian (3...b6), Bogo-Indian (3...Bb4+), Benoni (3...c5, often Benoni players play the Nimzo to avoid the dangerous lines with f4), or Queen's Gambit Declined (3...d5).  Obviously 3...c5 is the riskiest, but White can maintain an Anti-Benoni, heading into English Opening territory.

After 1.d4 Nf6 2.c4 c5 3.Nf3 is the Anti-Benoni.  One can argue the Kasparov Gambit (3...cxd4 4.Nxd4 e5 5.Nb5 d5 6.cxd5 Bc5), but again, two decide the opening, not 1.

After 1.d4 Nf6 2.c4 g6, the move 3.Nf3 is a bit unusual, but it can lead to e3 lines instead of e4 lines of the King's Indian or Grunfeld defense.

So long story short, learn strategy and don't just rely on quick cheap shots.

If you like aggressive play then 3...c5 might be a good choice, inviting a Benoni.

Learn the Catalan its a fun opening. C4,NF6, D4,E6, NF3 d5, g3, Be7 or BB4 or Dxc4 the closed Catalan, the bogo Catalan, the open Catalan.