There are 2 main explainations for the nature of God as Father, Son, & Spirit.
The first is the most common which is the trinity view. It teaches that the terms Father, Son, & Spirit are 3 persons yet somehow still one God.
Then there is the oneness view which states that the one God simply manifests Himself in 3 ways. That these manifestations are "Likened" to persons, but in reality there is simply one God. No mystery about it.
Isaiah 43,11 states;... "I, even I, am the Lord; and beside me there is no savior".
Rev 4,2 states that one sits on the throne, not 3.
To help you unravel this great mystery I suggest the following book.