God made everything, including people. But because people are ingrates, we didn't get it, so he sent us John the Baptist to tell us that Jesus was on his way. Then Jesus came, but because we're ingrates, most of us didn't get it. God will adopt those who did get it.
Sudden transition back to John, who tries to tell people that Mosaic law is not enough, we also need grace and truth (v. 17). The priests hear about John and send for him. He says he's not the Messiah. They ask him if he's Elijah. Nope. Well, who is he, then? I am the voice of one crying in the wilderness. God, I hope not. The Pharisees come along and ask why he baptizes people, if he's neither the Messiah nor one of the prophets. John says he only uses water and Jesus is on his way. The next day, Jesus himself shows up and asks to be baptised. Several miracles happen.
As Jesus is leaving, John says Behold the Lamb of God! (v. 36). A couple of his disciples hear this and follow after Jesus to ask where he lives. He invites them over for coffee. One of them is called Andrew, who is Simon Peter's brother. He goes to find his brother and tells him he's found the Messiah. Simon Peter comes along and obtains a third name, Cephas, which means stone. Next Jesus goes and finds Philip, who in turn finds Nathanael, who hilariously asks, Can there any good thing come out of Nazareth? (v. 46) But he comes along anyway. Jesus recognises him, and Nathanael asks how. Jesus says he saw him under a fig tree. Nathanael is impressed. Jesus tells him he ain't seen nothing yet.