These verses give the setting for the incident. Again Luke pointed out that the crowd was listening to the word of God ( Luke 5:1; cf. Luke 4:32; cf. Luke 4:36). The people were so interested that they pressed upon Jesus. Jesus put some distance between them and Himself by teaching from a boat not far off shore. [source][source][source]
Luke described the Sea of Galilee as a lake, as most of His readers would have thought of it. Gennesaret was the town and plain on its northwest coast from which it received its name. [source][source][source]
Luke"s characteristic attention to detail is obvious in that he referred to two boats, setting the stage for Luke 5:7. Evidently the fishermen had used large dragnets (Gr. diktau) when they had fished all night, which Zebedee, James , and John were now washing and mending ( Matthew 4:21; Mark 1:19; Luke 5:2). Peter and Andrew were using a smaller round casting net (Gr. amphibleston), throwing it into the water from close to shore ( Matthew 4:18; Mark 1:16). [source][source][source]
"It was a busy scene; for, among the many industries by the Lake of Galilee, that of fishing was not only the most generally pursued, but perhaps the most lucrative." [1][source]