Do not take this free pawn (you will get a bad position)
Develop the Knight instead
When black puts the bishop on the long diagonal
You can moves your Queen here
Now when Black takes this pawn
You can take back with the bishop
After another exchange
White takes this pawn
Black replies by taking back w/ the Bishop
White takes back with the Queen
And attacks this Rook (Queen in dominant position)
Black can respond by moving the Rook here
But we just castle Queenside
And get a great position