What does Acts 18:11 mean?

This is the longest Paul has stayed in one place, besides his home church of Syrian Antioch, in quite some time. He is in Corinth, building a new church with the help of many friends.

When he first reached Corinth, he met Priscilla and Aquila, two Jewish tentmakers who had been expelled from their home in Rome (Acts 18:2). Silas and Timothy then joined them from Macedonia (Acts 18:5). When the synagogue decisively rejected Paul's message that Jesus of Nazareth is the Jewish Messiah, a Gentile God-worshiper named Titius Justus and the ruler of the synagogue, Crispus, followed Paul (Acts 18:6–8). Now, they, as well as the family of Stephanus (1 Corinthians 16:15), serve as the base for the new church.

Despite Paul's extended stay, the church continues to have problems after he leaves. The temple prostitutes of Aphrodite mark a particular sexual looseness among the inhabitants that creeps into the church (1 Corinthians 5:1; 6:12–20). Members of the church split into divisions, claiming to follow individual teachers (1 Corinthians 1:10–13). They believe baseless accusations that Paul merely wants their money (1 Corinthians 9). Paul becomes so hurt at news about the church he even cancels a trip to see them because he doesn't think he can control his anger (2 Corinthians 1:23).

"Word" is from the Greek root word logos. We think of the "Word of God" as the Bible, but before the books spread throughout the church, it meant the message God wanted the church to have, mainly that Jesus' death and resurrection offers forgiveness of sins and reconciliation with God. In fact, Jesus is the logos of John 1:1. Considering the difficult time the church in Corinth has with fighting their sin, God's forgiveness is an important concept for them to learn.