Jesus and his disciples were preparing for the Passover feast, the Passover feast was a feast celebrated for when God saved all babies of Israel from dying. While eating with the disciples, Jesus said one of the disciples was going to betray him and at that point some started asking questions. Jesus broke bread and shared wine, after which Jesus washed their feet one by one. Jesus told them to do the same to others too.
This book teaches us on humility and willingness to serve.