靖 is built from the 立 and 青 components.
It reads セイ like 青, as do 情, 請, 清, and 精 — learn 青 once and the family's reading comes with it.
A common word using 靖 is 靖国神社 (やすくにじんじゃ), meaning “Yasukuni Shrine”.
Kanji that look similar include 新, 暗, 傍, and 境.