Who can tell me what the Trinity is with a simple metaphor? I can't understand this question at all.

It is not easy to understand this problem. Because we all use human thinking to understand, it is impossible to understand. We only know what the naked eye sees and the limited power that God has given us. If we just stay in human thinking, we can't understand it.

So we should jump out of the imagination of the human world.

You don't see what the spirit looks like, you don't know how powerful the spirit is, and you don't know what God looks like. We should accept the fact completely and accept him confidently (without doubt). No one can explain the trinity concretely and accurately.

How do you understand that God is everywhere? At the same time, he can listen to the prayers of believers and help people in need in all corners of the world.

God is omniscient and omnipotent. He can come into the world to redeem mankind, show God's own actions, and personally spread the mystery of the kingdom of God. He can also become the holy spirit and live in believers. He can do anything according to his righteousness. He is a trinity, so it is not difficult to understand and accept. Man can't work at once, but God can, because he is omnipotent.