Hecate is the goddess of
Magic and Enchantment
and the Queen of Witches.

She is a Moon goddess and
embodies the waning and dark moon.
the time of sorcery.

Hecate is the guide of sailors.

Since she can control storms,
she can effect harvests.
Her festival is mid-August,
just before harvest-time.

• Attributes: Fertility mother goddess, with double aspect: protectress and destroyer, mighty magical Queen of ghosts and loving and helping corn-mother like Demeter. Triple Aspect of the Goddess: Maiden, Mother and Crone.
  Shares many attributes with Morrigan, Kali and the Inanna.

All wild animals were sacred to Hekate, and she was sometimes shown with three animal heads - the dog, snake, and lion, or alternately the dog, horse, and bear. This aspect refers to her rulership over the ancient tripartite year of spring, summer, and winter. However, her primary animal form and familiar was the dog or wolf.

• 
  Wolfs, Dogs, Snakes
  

  Torches are Her symbol, for the Dark Mother also holds the light which illuminates the Unconscious and reveals its treasures.
  
  

• Sacred Plants: Yewtree, the tree of death (greek: taxus),
  Hemlock (see f.e. Shakespeare: Macbeth IV, 1.25)

• Key (to the Underworld), Rope, Dagger.

• The Moon, especially the full or the dark moon.

"The Chtonian" was a -still in roman times- very popular Greek goddess, often accombined with Artemis or Persephone, who's role -like mentioned before- transformed from a goddess of fertility, childbirth, protectress of mankind and all other earth-aspects from groth to death into a Queen of ghosts, a mighty and scary Goddess of Magic, Nights, the time of the waning moon, where she could could give vision and assist in magical procedures.

She was the Goddess of the three-ways (crossroads), where she protected people from taking the wrong road. And she protected the Gates from any evil spirit to enter. She also guides travellers in general and sailors in particular. She held the keys to three roads: to Hades, to Heaven and to a lucky life on earth.

In later times she became the patroness of witches, magicians and sorcery. The Question is not, that Hecate did not have these aspects in her nature, it is whether these are her only aspects.

Many today-pagans worship either the wonderful, loving and caring, sweet and gentle good Goddess or the lunatic, dark aspects of the Goddess. My opinion and believe is that these aspects can only be seen as a whole and that Hecate combines all these aspects of nature as an incarnation of the Great Goddess.

Her annual festival in Greece was on August 13th/14th was a propitiary one, to avert the harvest-destroying storms which the Moon was apt to send at around that time.

One of her festivals celebrated in the city Stratonicea in Caria was called: Hecatesia.

As a goddess of the Moon she is often set equal to Selene. As a goddess of growth and fertilitiy, she is seen equal to Demeter. As a goddess of the hunt and the wild animals, she is seen equal to Artemis.
It is more than obvious that her attributes and her role have some similarities with Lilith and the dark sides of Ishtar and Astarte.

Hecate is a pre-olympian greek earth goddess. It is certain that her origin is Asia Minor (Karia). The greek sources don't have a similar story of her parents or her relations in the greek pantheon: Sometimes Hecate is a Titaness , daughter of Perses and Asteria, who is a mighty helper and protector of mankind. She is a Titaness who was not banned into the underworldrealms after their defeat through the Olympians, because she was the only Titan that aided Zeus.
It is also told that she is the daughter of Demeter or Pheraia, which appears understandable due to the fact, that Hecate like Demeter was a goddess of the earth and fertility. Or that she may even be a daughter of Zeus.
Like many ancient mother or earth-goddesses she remains unmarried and has no regular consort. On the other side she is the mother of many monsters, f.e. of  Scylla.

THE ARGONAUTICA BOOK IV (ll. 783-832):

Ausonian Scylla the deadly, whom night-wandering Hecate, who is called Crataeis, bare to Phoreys, lest swooping upon them with her horrible jaws she destroy the chiefest of the heroes.

But most sources agree that she is a goddess, who was never part of the Olymp or the olympian family, but still powerful and worshipped.

She aided Demeter with news about her robbed daughter Persephone:

But when the tenth enlightening dawn had come, Hecate, with a torch in her hands, met her, and spoke to her and told her news: (ll. 54-58) `Queenly Demeter, bringer of seasons and giver of good gifts, what god of heaven or what mortal man has rapt away Persephone and pierced with sorrow your dear heart? For I heard her voice, yet saw not with my eyes who it was. But I tell you truly and shortly all I know.' (ll. 59-73) So, then, said Hecate. And the daughter of rich-haired Rhea answered her not, but sped swiftly with her, holding flaming torches in her hands. (Homeric Hymns).

Leads Persephone back from Hades to Her mother, Demeter and gets reward:

Then bright-coiffed Hecate came near to them, and often did she embrace the daughter of holy Demeter: and from that time the lady Hecate was minister and companion to Persephone (Homeric Hymns, ll. 438-440)

The close connection between Hekate, Persephone and Demeter is interesting in that  one could suspect that the threesome is probably the earliest example of a triple-goddess involving Hecate.

She is also a mother-goddess who wears the lunar disk and carries a torch, referring to her role as lightbringer.

Description of Hecate in THE THEOGONY of Hesiod: (700 B.C.)


Then the goddess Gaia through the love of the god conceived and brought forth dark-gowned Leto, always mild, kind to men and to the deathless gods, mild from the beginning, gentlest in all Olympus. Also she bare Asteria of happy name, whom Perses once led to his great house to be called his dear wife. And she conceived and bare Hecate whom Zeus the son of Cronos honoured above all.

He gave her splendid gifts, to have a share of the earth and the unfruitful sea. She received honour also in starry heaven, and is honoured exceedingly by the deathless gods. For to this day, whenever any one of men on earth offers rich sacrifices and prays for favour according to custom, he calls upon Hecate. Great honour comes full easily to him whose prayers the goddess receives favourably, and she bestows wealth upon him; for the power surely is with her.

For as many as were born of Earth and Ocean amongst all these she has her due portion. The son of Cronos did her no wrong nor took anything away of all that was her portion among the former Titan gods: but she holds, as the division was at the first from the beginning, privilege both in earth, and in heaven, and in sea. Also, because she is an only child, the goddess receives not less honor, but much more still, for Zeus honors her. Whom she will she greatly aids and advances: she sits by worshipful kings in judgment, and in the assembly whom she will is distinguished among the people.

And when men arm themselves for the battle that destroys men, then the goddess is at hand to give victory and grant glory readily to whom she will. Good is she also when men contend at the games, for there too the goddess is with them and profits them: and he who by might and strength gets the victory wins the rich prize easily with joy, and brings glory to his parents.

And she is good to stand by horsemen, whom she will: and to those whose business is in the grey uncomfortable sea, and who pray to Hecate and the loud-crashing Earth-Shaker, easily the glorious goddess gives great catch, and easily she takes it away as soon as seen, if so she will.

She is good in the byre with Hermes to increase the stock. The droves of kind and wide herds of goats and flocks of fleecy sheep, if she will, she increases from a few, or makes many to be less. So, then. albeit her mother's only child, she is honored amongst all the deathless gods.

And the son of Cronos made her a nurse of the young who after that day saw with their eyes the light of all-seeing Dawn. So from the beginning she is a nurse of the young, and these are her honors. (ll. 404-452)

Many thanks and blessings to Kaitlyn who gave me this valuable information