John 12 is a chapter in the Bible that tells us stories about Jesus. Jesus was a very important person who came to teach people about God and how to love each other.
In this chapter, we learn that Jesus went to visit his friends who lived in a village called Bethany. One of his friends was a lady named Mary who loved Jesus very much. Mary wanted to show her love for Jesus by doing something special for him. So, she poured a very expensive perfume on Jesus' feet and wiped them with her hair. This showed us that we can show our love to others in different ways, even if it's not something that everyone would do.
Some people who saw this got angry and said it was a waste of money. They didn't understand why Mary would spend so much money on Jesus. But Jesus explained to them that Mary was doing a good thing, and that it was important to show love and kindness towards others, even if it costs us something.
Later in the chapter, we also see that many people came to see Jesus because they had heard about his miracles and teachings. They were excited to see him and wanted to hear more from him. But not everyone believed in Jesus or his teachings, and some people even wanted to hurt him.
Overall, John 12 shows us that it's important to show love and kindness towards others, even if it costs us something. It also reminds us that not everyone will agree with us or believe in what we do, but we should still stand up for what we believe is right.