功 is built from the 工 and 力 components.
It reads コウ like 工, as do 攻, 江, 項, and 貢 — learn 工 once and the family's reading comes with it.
A common word using 功 is 功績 (こうせき), meaning “achievements, merit”.
Kanji that look similar include 左, 巧, 式, and 江.
