The new movement became more than a little section of the Jewish faith. It became a particular faith itself. Now they are planning on taking the goods news of the Gospel literally everywhere. Saul was incorporated into the new faith and along with Barnabas they started a power revolution among the gentiles.
Now churches were planted everywhere these two men went. The grace of God was brought to Jews and gentiles indistinctly. The gentile side of the church was growing in an overwhelming way that some more Jews oriented Christians were trying to impose over the new believers the laws of Moses along with the Gospel.
The church met and decided that was not necessary for gentiles to follow the Law of Moses in the same way the Christians jews were doing it (chapter 15) for the gentiles and their leader this was a battle that they have to fight over and over until the Christian Jews acknowledged that Christ alone was the requirement to belong to the people of God.
This section is especially dedicated to Apostle Paul and his disciples. He was a very committed and passionate man who understood that Christ was to be preached everywhere. The best way of doing that according to apostle Paul understanding was by training new disciples whom will continue to carry on the legacy and blessings of the gospel.