The doctrine of Trinity is a great mystery, difficult for the human mind to comprehend. Yet it is absolute truth. The Three Persons: The Father, the Son and the Holy Spirit, make up the One Being.
God the Father is the Source of all creation. He is the giver of life. John 5:26
God the Son is the image of the invisible God. He is the Redeemer, Ph 2:5-6
God the Holy Spirit is God in action, reaching people, influencing, changing and guiding them, John 15:26
All the three are: a-Tri-Unity God, living in one another and working together. Each of them is equal to the others in power, glory, wisdom, holiness and eternity, Matt 28:19