「〜ば〜ほど」 is a core JLPT N3 pattern for proportional change: “the more…, the more…”. The article explains verb, い-adjective, な-adjective, and noun patterns, omission of the first 「〜ば」, common 「〜ば〜ほどいい」 expressions, differences from 「〜ば〜だけ」 and 「一方だ」, and comparison with Korean 「〜을/를수록」.