Re: 1. e4 c5 2. c3 d5

1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4

thanks, so 3.exd5 is the best move, can you please explain why and what
is the threat for and by black ?

Well, Black is forced to develop his Queen early to maintain material
equality. Black's queen can become a liability when White later plays
Nc3 or c4. Black's king is also exposed along the a4-e8 diagonal.

White has to be careful about Black's lead in development and centrally
placed queen. In addition, 4...cxd4 could be used by Black to force a
queen exchange or an isolated pawn.

.

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