証 is built from the 言 and 正 components.
It reads ショウ like 正, as do 政, 定, 従, and 症 — learn 正 once and the family's reading comes with it.
A common word using 証 is 証明 (しょうめい), meaning “proof, verification”.
Kanji that look similar include 訴, 診, 詐, and 評.
