Attacking the g7 (g2) pawn

After king has castled,attacking the g2 pawn (usually with rook) to destroy enemy's defenses is a method that we are going to analyze with some examples.

At the first diagram black is threatening Qa1 mate but white takes advantage from the open g file

Black threatens check at a2..

White has gave 4 pawns to develop his pieces and now is hoping for a nice combination..