The Holy Spirit appears as fire to the believers. The gift of other tongues is given immediately. Peter preaches the first sermon after the resurrection of Jesus. Many come to believe!

The disciples and others get to spend 40 days with Jesus after his ascension and brief return. The Holy Spirit is promised

Why Luke broke it into two parts, gospel and Acts. What it shows us of discipleship and Jesus being alive in the world. Would the epistles have made any sense without this book? Luke's second book could be called the Acts of Jesus or the Acts of Jesus and the Spirit. It is the only account that we have of what happens after Jesus' resurrection before we get into the second century non-biblical Christian writings talking about the church.

A discussion about his books:

Dr Elzinga discusses being "nice" when presenting Jesus to our friends, neighbors and co-workers.

Discussion about early post New testament writer Justin Martyr. His life and his approach to Christianity