[noun] + に対して [noun] + に対する + [noun] [verb (plain)] + のに対して [i-adj] + のに対して [na-adj] + な + のに対して [noun] + な / である + のに対して
に対して after a noun marks who or what an action, a feeling or an attitude is aimed at: "towards", "to", "against". It is more explicit than a bare に, and a little more formal.
Before a noun it becomes に対する, or に対しての.
After a clause, のに対して sets two facts side by side: "while", "whereas". A verb or an い-adjective takes の directly; a な-adjective or a noun needs な first.
に対して points an attitude or a reaction at something. について gives the topic you talk, write or think about. "Talk about the plan" takes について.
These go beyond pointing at a target and contrasting.
Between two numbers, に対して gives a ratio.