Of course everyone knows who God is, but when you get to the four gospels of Matthew Mark Luke and John, you are introduced to Jesus the Son of God and his mission. Hebrews clearly defines who Jesus is and the fact that he is also God, and was with God when the world came into being. In acts...
In all actuality, for you to understand the trinity, not only must you know the Holy bible, God's word, and believe it to be the authority of God given to man. The bible clearly explaines who God is. Three divine and wholly equal beings as one God.