"Around the throne, and on each side of the throne, are four living creatures, full of eyes in front and behind: 7 the first living creature like a lion, the second living creature like an ox, the third living creature with a face like a human face, and the fourth living creature like a flying eagle. 8 And the four living creatures, each of them with six wings, are full of eyes all around and inside. Day and night without ceasing they sing,
“Holy, holy, holy,
the Lord God the Almighty,
who was and is and is to come.”
One popular interpretation of the symbolism of the four living creatures is to note their congruence with traits of each of the four Gospels, as the author does at bibleref.com: Bibleref link
Also, there are parallels between the vision of John of Patmos and that of the vision of the 'Throne-chariot' given to Ezekiel in chapter 1:14-28: Vision of the Throne-Chariot.
I like this article at Theology Pathfinder as well, because of the humility of the author toward the difficulty in interpreting such strong imagery: Theology Pathfinder link
The number four also has congruence with the four kingdoms represented by four beasts that are talked about in the Book of Daniel, as described by the author at gotquestions.org: link
If you want to accept Salvation from Christ here are some resources:
A Prayer for Salvation from Christ:
Lord Jesus, I confess my sins and ask for your forgiveness. Please come into my heart as my Lord and Savior. Take complete control of my life and help me to walk in Your footsteps daily by the power of the Holy Spirit. Thank you Lord for saving me and for answering my prayer.
A more detailed step by step process:
https://www.wikihow.com/Accept-Jesus-Into-Your-Life
