Moses and Aaron were fearless leaders in the wilderness. Even though God provided, the people continuously complained. God provided again, and they people complained again. Over and over this repeated. God was angered, and introduced snakes into their midst to test their faith. Does this sound like what is happening today? God continually blesses us, yet we fail to see His love and provisions. Since the fall of mankind, humans have been slaves to sin. Only Jesus can save us.
See how God uses average people to do His miraculous work. In Exodus, Moses thought he was unskilled and unprepared to do God's work, yet God proved him wrong. In John 2, Jesus performs a miracle by changing water to wine. Jesus taught us to believe that nothing is impossible with God, and that we are to follow His commandments.
Jesus conquers temptation in the 40 days of wilderness. Christ teaches us through wilderness and tough times, we learn to overcome temptation by seeking God. The wilderness is the start of the Lent season leading us to Easter.
In the New Testament, Transfiguration is when Jesus Christ took three of his disciples, Peter, James, and John, up on a mountain, where Moses and Elijah appeared and Jesus was transfigured. His face and clothes became dazzlingly bright. The Transfiguration is a preview of the future when the Son of Man will come in glory to consummate his kingdom. 
In the beginning, God created everything from nothing. He spoke things into existence that were not there before. Mark explains in his gospel that Jesus was baptised to show us that as God created, baptism creates us into something new. Jesus didn't need to repent from sin as He is divine, but we must repent in order to be saved. Christ's baptism also is a significant milestone in the start of His worldly ministry.