Initiating a central advance.

An excellent diagonal in the absence of a bishop on g7.

White has a pleasant position.

Gaining some space and enabling a future attack.

This just helps White in opening lines towards the black king. 1...Be6 was safer, preparing to meet 2.g5 by 2...Nd7.

4...Nxe3? 5.Bxe3 Rxe3 6.gxf6 Qxf6 7.Nxd5 Qxh6+ 8.Rh2+-

Black resigned.

Preparing a2-a4 and b4-b5 to gain some space and harass the active bishop on a6.

3...c5? fails to 4.b5 , Black first gets rid of the bishop.

Creating a potential passed pawn.