How did the great length of the coastline affect the life of the Greeks?

Usually the length of the coastline suggests a very well-developed maritime business. The Balkan Peninsula, on which Ancient Greece was located, also had a well-indented coastline and many islands. On the one hand, yes, the Greeks were engaged in seafaring, on the other, they were still not that great sailors. They were mostly engaged in cabotage, that is, sailing within sight of the coast, moving from island to island. In the same way, they succeeded in colonizing distant territories.