Could you explain sentences below explicitly, caring about the meaning of 'for'?
For a man of his wealth he's not exactly generous.
He plays very well for a beginner.
It was a difficult decision, especially for a child.
The winter has been unusually cold for Florida.
For every two people in favour of the law there are three against.
They are from Cambridge dictionary with the explanation that 'for' is sometimes used for comparing one thing with others of the same type.