攻 is built from the 工 and 夂 (going / winter (top)) components.
It reads コウ like 工, as do 江, 功, 項, and 貢 — learn 工 once and the family's reading comes with it.
A common word using 攻 is 専攻 (せんこう), meaning “major subject, special study”.
Don't confuse it with 政, 改, 放, and 教.
