The book commonly known as "Acts" is short for "Acts of the Apostles" because it prominently features Jesus's called, gifted, and set apart messengers to expand His church. But this title is misleading.
The main character of Acts is not the Apostles but the Holy Spirit. Behind and beyond all the work the Apostles do is the third person of the Trinity, God the Spirit empowering their work and causing it to flourish.
As we read through the first 12 chapters of Acts, we join with them and with the Spirit, discovering the Spirit–empowered works they performed and entering the story with them—a story that is still in process today.