This is the only reference to Jesus' ability to read. There were three kinds of Law in the Old Testament, given by Moses. The Principle of Law and Gospel. It pertains to all people of all times of all cultures. Secondly, there was the Law of Ceremonies, which foreshadowed Christ.
Examples are circumcision, the Sabbath Day, the sacrifices, the Passover.
These shadows passed away when Christ died. Thirdly, there was the Political Law which governed Israel as a theocracy from the time of Moses until the time of Christ. It also foreshadowed Christ. A full explanation is found at Leviticus 25, which the preacher ought to read. That year brought freedom from financial debts.