Well, Gandalf could be telling a story about the great heroes of Middle - earth. He might be talking about Aragorn's lineage and how he is destined to be the king. Or perhaps he's sharing the story of how the dwarves lost their homeland and their quest to reclaim it. It could also be a story about the elves and their long and magical history in Middle - earth.
I'm not sure which specific story Gandalf is telling as there are many in the Tolkien's works. Maybe it's about the history of Middle - earth, like the battles against the dark forces or the tales of the rings.
Maybe he wants to pass on knowledge or history. Gandalf is full of wisdom and stories are a great way to share it.
Gandalf originated from a higher spiritual plane. He was dispatched to Middle-earth with a purpose. His background involves being part of a divine order and having a responsibility to bring hope and resistance against evil.
Well, Gandalf is from the Ainur. He was among those Maiar who were sent to Middle - earth. His purpose was mainly to help the good against the forces of evil like Sauron. He was created long before the events in Middle - earth started to unfold. Gandalf's origin story is deeply intertwined with the greater cosmology of Tolkien's world. He had powers that were both magical and related to his wisdom and knowledge, which he used to influence the course of events in Middle - earth.
You could try 'The Silmarillion'. It provides background and additional context related to Gandalf and the broader Tolkien universe.
Well, first off, Gandalf being a Maiar is a huge part of his origin. It gives him his power and wisdom. Then, the fact that he was sent to Middle - earth by the Valar is also crucial. This mission from the Valar shaped his role in Middle - earth. He was part of a group of Istari, and this also stems from his origin story as he was chosen for this role because of his nature as a Maiar.
The fact that Gandalf is from the Ainur is a very important part of his origin story. Also, his transformation into the form of an old man is significant. It allowed him to interact more easily with the races of Middle - earth, like humans, dwarves, and elves. And of course, his being sent to oppose Sauron is a central aspect of his origin. It shaped his entire journey in Middle - earth.
His being a Maia and sent by the Valar.
There is no "Gandalf the Black" in the original Tolkien lore. Gandalf is known as Gandalf the Grey, and later Gandalf the White. So, there's no story for this non - existent character as such.
Gandalf is a Maia. He was sent to Middle - earth by the Valar. He was one of the Istari, a group of wizards. His purpose was to guide and oppose the rising power of Sauron.
The Lord of the Rings series by J.R.R. Tolkien features Gandalf and his adventures extensively.