Chess Opening Theory/1. d4/1...Nf6/2. Nf3/2...e6

=Queen's Pawn Opening=

2...e6
A typical black move in Queen's Pawn Openings, 2...e6 allows black to develop the f8 bishop, after which castling will be possible.

Theory table
'''1. d4 Nf6 2. Nf3 e6'''