When I was a kid, every Saturday morning I attended catechism classes at our local church.
Catechism is a summary of principles of doctrine or fundamentals of a faith, often in question and answer form.
Every Saturday morning I sat in a classroom and the teacher quizzed us on what we needed to know about our beliefs: Who is God? God is the Creator of heaven and earth.
Who is Jesus Christ? Jesus Christ is the Son of God made man.
I can still recite some of my catechism lessons from 40-plus years ago.