Penned by Luke, the author of the third gospel, which recounts the beginning of the ministry of our Lord Jesus, the book of Acts is the sequel, narrating the continuation of His ministry through His chosen apostles.  It describes the birth of the church and the fulfillment of the OT promise of the outpouring of the Holy Spirit and the effects thereof.  Though not all that we see in Acts in normative (or standard) Christian experience, it does provide a great framework of early Christian faith and practice as a sort of plumb line for measuring the soundness or unsoundness of contemporary Christian faith and practice.  We should read it with care.