請 is built from the 言, 申, and 青 components.
It reads セイ like 青, as do 情, 清, 精, and 静 — learn 青 once and the family's reading comes with it.
A common word using 請 is 申請 (しんせい), meaning “application, request, petition”.
Don't confuse it with 精, 清, 晴, and 静.
