After the opening has finished, look at your pawn structure.
In the chess position above you see that a certain pawn structure has evolved right after the opening. Now you have to find a plan to proceed the right way. We look at it from White's point of view. White has three pawns versus two pawns at the queenside. Black has his majority at the kingside - four pawns versus three.
If you have White you have to use this energy potential and play at the queenside to gain space and create a passed pawn later. See how the plan is executed. Replay the position here: