Do you know when the Catechism of the Roman Catholic church came into existence? Has there ALWAYS been such a document for Catholics?
The AP was the basis for most subsequent catechetical materials: the catechism consisted of the creed taken line-by-line, with an explanation of each line. Many catechisms followed that up with the Creed + the Seven Sacraments + the Ten Commandments + the Eight Beatitudes --- the present "Catechism of the Catholic Church" (1997) pretty much follows that pattern, which you will see if you skim over the Table of Contents
Before the present Catechism, a lot of dioceses relied on the "Baltimore Catechism," which was approved by U.S. Bishops in the late 1800s.