What to do when you opponent only pushes pawns at the beginning of the game?

Hi everyone. 

I'm not a very good chess player and I struggle to understand how to punish my opponent when all they do is push their pawns at the beginning. Often times they get a good position and uses their pawns to force all my pieces to go back. Can someone please teach me what to do in such position and how to access the situation? 

Thank you

Every Pawn advance weakens the squares left behind in the wake of the advancing Pawn, and also uses up time that might otherwise have been devoted to developing your pieces. So when your opponent wastes time with many Pawn advances, be alert to the possibility of opening up the position... either by a Pawn lever or even by a sacrifice... in order to exploit your superior development and mobility.

The advantage of better development is increasingly important the more open the position is.

Here's an example game where my opponent... a 2200-rated player... pushed Pawns aggressively right in the opening, but lost control of the squares (especially, the diagonals) left behind the advancing Pawns.

A Heroic Defense in the Sicilian Najdorf - Kids, don't try this at home! - Chess Forums - Chess.com

Nice example blueemu, cheers to that.

Whenever I develop my pieces, my brother just pushes them back, suffocating them. I found If I could get my queen behind him I can fork his king and one of his base pawns. Whenever I play him I learned to do

1) Wayward Queen

2) Napoleon Attack

3) London System because don't like thinking

#1
Pawn moves are not developing moves. Pawn moves cannot be undone. Each pawn move creates some weakness. You have to think. As #2 indicates indeed 5 Nxb5 refutes the black play, but you need to think to find that move. 5 Bb3 is logical at first glance, but misses the opportunity to win. 

Nice example thanks. It was so helpful