The book of Acts in the Bible describes the first 30 years of the church. It’s an historical narrative that was written by Luke who was a companion of Paul (Col. 4:10-14; 2 Tim. 4:11; Phile. 24). He wrote it to educate Christians about the early church.
The main point of Acts is that God’s witnesses spread the gospel message and established churches.
A time line of major events in Acts (concentrating on Acts 1-12) is given below. And it is followed by a summary of the book (also concentrating on Acts 1-12).