Matthew 17

So some of my thoughts on this chapter. Christ is transfigured before Peter James and John and it says that he talked with Moses and Elias. I wonder what were they talking about? Why was that important? Peter than talks to Christ and says "it is good for us to be here. Let us make three tabernacles one for thee, Moses and Elias." What is the significance of those? than it says the voice of God came out of a cloud and said "this is my beloved son in whom I am well please. Hear ye him." and they were afraid..
My first thought is they just saw Christ transfigured and talking with two angels and they were afraid of a voice coming from heaven? So, I wonder what exactly made them fearful? Than I love how Christ touched them and said be not afraid... That is a loving act. I think of in my own life how I am afraid sometimes and I want to remember this scripture.
Also Heavenly Father said hear ye him. So I know that whatever Christ is going to say next is important.. Then he goes on to talk about Faith...