What do adjectives modify?

Things that modify nouns are adjectives or equivalent to adjectives.

We want to modify the regulations of our school.

Based on my observation of the movement of particle D, I modify the system so that three possible exits exist.

I beg to modify your proposal.

Terraformers wanted to modify the Venusian atmosphere so that some day it might support life.

What do adverbs modify?

You'll have to modify the height of the table to make it fit.

We usually modify our views in college.

Things that modify nouns are prototypically adjectives or equivalent to adjectives.