0Never move silly pawns anywhere in the beginning of the game, especially not on the outer files like Black has done below. You just lose time and run behind in piece development.
This means that your opponent can and will attack you with his pieces, once he has castled. Pieces are: knights, bishops, rooks and the queen, not pawns! He can attack you as he has more pieces developed than you have. He will simply overrun you in the center because he has more knights, bishops, rooks and the queen actively placed and you got no pieces placed actively to defend yourself. Why? Because you have wasted your time to push some silly pawns here and there and may have not even castled.
It is very important that you understand this principle!
Read this text above a hundred times to get this into your head or you will never ever become a good player. So don't touch useless pawns in the beginning of the game.
You should first move one or two center pawns, then develop your knights and bishops towards the center. Best is to get the kingside knight and bishop out, then castle quickly. See the white position. White is going to get out his kingside bishop next and castle afterwards.
