Our Catholic faith comprises what we believe and how we live that belief. For 2,000 years, this Catholic faith has been handed down from one generation to next, starting with Jesus Christ teaching the faith to the Twelve Apostles, who handed it down to their successors the bishops through Sacred Scripture, Sacred Tradition, via the Magisterium of the Catholic Church. In our own lives, we may receive that faith from our parents, from friends, or even a stranger we meet.
Learning about God and forming our faith may start for many as children, but can also start at any point in our lives! The important thing to remember, is that faith formation - growing in knowledge of and closer with God is something that should be happening throughout our entire lives - getting us ready to spend eternity in Heaven!
The whole liturgical life of the Church revolves around the Eucharistic sacrifice and the sacraments. There are seven sacraments in the Church: Baptism, Confirmation or Chrismation, Eucharist, Penance, Anointing of the Sick, Holy Orders, and Matrimony. (CCC, 1113)