Why were Olympian gods considered as the main gods in Greek mythology?

The Olympian gods were considered the main gods in Greek mythology because they were seen as the most powerful and influential deities that had dominion over the world as well as other deities. Their dwelling place Mount Olympus was the highest mountain in Ancient Greece which was considered a divine, sacred place, symbolizing power, valiance and influence, making them central to myths and other religious pratices.

Therefore, these gods were often depicted with very human traits(emotions, desires, flaws) which made them more relatable to the people of ancient Greece and used in conversations to explain their belief and understanding of the world at that time.

The Olympian gods, main gods in Greek mythology

The Olympian gods or Olympians are younger gods who got the name after their mythical place Mount Olympus. They had gained rank as the rulers of the world after dethroning the elder gods, known also as the Titans, in a ten-year war called Titanomachy. The Olympians, as they called themselves, were the main gods of Ancient Greece and were representing civilization of the world.

Twelve Olympians

The first generation Olympians were descendants of a titan couple Cronus and Rhea. Together they gave birth to six children, three sons and three daughters. The sons were Poseidon, Hades, Zeus and daughters Hera, Hestia and Demeter. Zeus, Poseidon, Hera and Demeter are always considered as Olympian gods while Hestia and Hades are only included at some point of their existence. Hades was supposed to live on Mount Olympus and had every honour and right to but was given the realm of death under his control, when the three brothers had to split the cosmos after the victory over Titans.

There was a place for Hestia on Mount Olympus but she is never recorded living there, as she preferred it having her own way of living. Regrardless, there were only twelve places on Mount Olympus and the desire for these was huge among gods. The second generation Olympians were Athena, Ares, Hermes, Dionysus, Apollo, Artemis and Hephaestus. Aphrodite is also sometimes considered as the second generation goddess and other times to be from the titans generation, depending on the source, but always had a place to stay on Mount Olympus. All of these gods were, at some point, referred to as the Olympian gods and together they presided over every aspect of human life.

First Generation
Demeter
demeter

Goddess of harvest and fertility

Hades
hades

God of death and the dead

Hera
hera

Goddess of marriage and childbirth

Hestia
hestia

Goddess of the hearth and domestic affairs

Poseidon
poseidon

God of sea, floods and earthquakes

Zeus
zeus

God of the sky and weather

Second Generation
Aphrodite
aphrodite

Goddess of love, beauty, pleasure

Apollo
apollo

God of light and sun

Ares
ares

God of war, violence and destruction

Artemis
artemis

Goddess of hunting and wilderness

Athena
athena

Goddess of wisdom, strategy, warfare and skill

Dionysus
dionysus

God of wine, festivals and pleasure

Hemres
hemres

God of travel, trade, diplomacy, persuasion, writings and athletics

Hephaestus
hephaestus

God of craftsmanship. blacksmiths and stonemasonry