In this section of Acts, Paul travels to Corinth, meets Aquila and Priscilla, and begins preaching the Gospel. He, then, finishes his ministry there and begins his third missionary journey in the regions of Galatia, Phyrgia, and the city of Ephesus.

Here is a link to David Guzik's commentary on Acts 18:1-22: https://enduringword.com/bible-commentary/acts-18/