Torre Attack: Classical Defense is a chess opening with the ECO code A46, part of the Torre Attack family. It goes 1. d4 Nf6 2. Nf3 e6 3. Bg5. White opens with 1. d4 (the queen's pawn) and Black answers 1... Nf6. After 5 moves it is Black to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
In chessGM's opening book this position continues with 3... c5.
White plays d4, Nf3 and Bg5, pinning the f6 knight. It is a simple system with easy development.
chessGM has a full course for this line: open the Torre Attack: Classical Defense course lesson.