Up to here a standard opening, but white moves knight for the second time. Considered a no-no until other pieces have been developed.

Black should have captured the knight with the queen's pawn. As a result, black is now already a pawn down.

On the face of it, a stupid move by white who could have got its knight out of danger. Maybe counting on black doing the same bad move again, maybe just carelessness.

Black did the right thing this time, although it may have messed up black's castling.

stupid move by white, who should have protected or retreated that white-square bishop currently under threat.

Black did the right thing and is now threatening white's rook as well.

Another stupid move by white, considering that endangered rook.

White made the wrong choice (a 3-point knight, rather than a 6-point rook).

Wonder why white didn't do Re1 and skewer black's queen and king? Another stupid move by white.

White's just used 2 moves to take the D pawn 2 steps, could have been done in 1. Not productive, and still ignoring that lovely skewer.