The importance of developing pieces in chess cannot be overstated. Unless you are following a theoretical line or really know what you are doing, you usually should not make more than 2 or 3 pawn moves in the opening phase of the game. In most cases, you want to take your share of the center (or challenge it), and then focus on developing your pieces to or toward their ideal squares for your middle game plan.
The game below is an anon game that I just played on LiChess. It was a bit comical, and it is perhaps one of the more extreme examples you will see, but my opponent simply refuses to develop pieces. I did not play the most crushing moves, but I didn’t have to. Simple development led to an overwhelming position in just a handful of moves.
If you want to try to find some of the tactics or stronger moves that were available, play around with the pieces a bit. One idea is to break in the center earlier. There is also a piece sacrifice that I could have played. I wasn’t too worried about it in the game, as it was clear that Black would suffer a crushing defeat, but it would have been more fun to really destroy him for his pawn pushing.