As White, this first move took longer to find than practically all of the rest of the moves put together. In blitz, you’d probably just play it without a clue and still get it right. After White’s reply, Black is in deep trouble in either case. The tactical implications of a Queen getting shunted to the side are that the king loses a great defender/attacker.
Black responds with Ne7, as Bg5 is such a tough threat to meet after …Rc8 Rc1, when the threat is RxN followed by Ne7+, picking up the possible bishop on c6; I’ll calculate the exact details should it arise.
Black flinches here, playing f6, which leads to Ne6 fork, but it’s not hard to see the threat of Ng5, e6, and Nf7 trapping the queen, or winning the exchange and drawing his king onto the f-file, where Qa2+ should win another piece.