Catechesis and liturgy
"The liturgy is the summit toward which the activity of the Church is directed; it is also the font from which all her power flows."
It is therefore the privileged place for catechizing the People of God.
"Catechesis is intrinsically linked with the whole of liturgical and sacramental activity, for it is in the sacraments, especially in the Eucharist, that Christ Jesus works in fullness for the transformation of men."
Source: Catechism of the Catholic Church (Vatican.va)