In Acts 18 Paul arrives in Corinth. Here we learn that Paul is a tent-maker or leather worker. He meets a married couple, Aquila and Priscilla who are also leather workers and have been forced to leave Rome. Paul ends up staying 18 months in Corinth. Scholars believe during this time he writes letters to the believers in Thessalonica, what we know as 1 & 2 Thessalonians.
We get an indication that Paul’s group sometimes splits up when in verse 5 it states that Silas and Timothy arrive from Macedonia, perhaps Philippi.
Again the same pattern happens in Corinth, some who reject Paul’s message cause trouble, bring him before the civil authority, Gallio, who in this case says he doesn’t care about their religious beliefs.
Paul eventually leaves, going back to Asia Minor (Turkey) to Ephesus and other cities in the area.
In Ephesus while Aquila and Priscilla are there, Apollos arrives preaching about Jesus but his practice of baptism is only John the Baptist’s type. You may recall Apollos being mentioned in 1 Corinthians. Aquila and Priscilla befriend Apollos and privately teach him more fully about baptism as it relates to Jesus.