Trinity

Trinity simple means "triunity."  God is not a simple unity; there is plurality in his unity. The Trinity is one of the greatest mysteries of the Christian faith. Unlike an antimony or paradox, which is a logical contradiction, the Trinity goes beyond reason but not against  reason. It is known only by divine revelation, so the Trinity is not the subject of natural theology but of revelation but of revelation.

The word Trinity is not used in the Bible, the concept is clearly taught in the Bible. The logic of the Trinity is simple. Two biblical truths are evident in the Scripture, the logical conclusion of which is the Trinity:

1) There is one God.
2) There are three distinct persons who are God: Father, Son and Holy Spirit.

I know that this topic is a big one so I will be talking about there is one God.
The central teaching of Judaism called Shema proclaims: "Hear, O Israel: The Lord our God, the Lord is one" (Deut. 6:4). When Jesus was asked the question, "What is the greatest commandment?" he prefaced the answer by quoting the Shema (Mark 12:29). In spite of his strong on the deity of Christ (Col. 2:9), the apostle Paul said emphatically, "there is but one God, the Father, from whom all things came and for whom we live" (1 Cor. 8:6a). From beginning to end, the Scriptures speak of one God and label all other gods as false (Exod. 20:3; 1 Cor. 8:5-6).

The Bible also recognizes a plurality of persons in God. Although the doctrine of the Trinity is not explicit in the Old Testament as the New Testament, nonetheless, there are passages where members of the Godhead are distinguished. At times they even speak to one another (Psalm 110:1)

YouTube link: https://www.youtube.com/watch?v=Sh72wgZEcKk