Recommendation for learning Openings

[Chessqueen]

The Previous Topic can Not be Open, there is some problem with it, so we can continue here .............................................
I just found this video on Youtube, and there is no good response to it the best response would be to play 4. d4! anything else would lose


[pgn][Event "Computer chess game"]
[Site "MININT-UB2PIMJ"]
[Date "2022.04.19"]
[Round "?"]
[White "Steve"]
[Black "ChessQueen"]
[Result "*"]
[BlackElo "1770"]
[ECO "C50"]
[Opening "Italian"]
[Time "05:55:24"]
[Variation "Rousseau Gambit"]
[WhiteElo "1950"]
[TimeControl "900+10"]
[Termination "unterminated"]
[PlyCount "7"]
[WhiteType "human"]
[BlackType "human"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 f5 4. d4 ![/pgn]