In this passage we see Peter give his testimony of the conversion of Cornelius and his household to the church in Jerusalem. In so doing he quietens the division in the church that would see believers become Jews before they become Christians.

We also see the power of encouragement as evidenced by Barnabus. He also recognizes the spiritual need of the new believers in Antiochs and encourages Saul/Paul to come to Antioch for the sake of these new converts.

Finally, we see a great example of New Testament giving:  see the need --> give as you are able.

Supplementary commentary material here.  Here (again) is the map of the area, including Antioch.  At the time, it was the third largest city in the Roman Empire.