The closest that Star Wars canon has come to naming who trained Yoda was revealing that Jedi Master Qui-Gon Ginn was the one who taught Yoda to become a Force Ghost and attain immortality. As Yoda tells Qui-Gonn in the novelization of Revenge of the Sith, "A very great Jedi Master you have become, Qui-Gon Jinn.
Becoming the mentor to Obi-Wan Kenobi, Qui-Gon Jinn sought to teach him the best he could. Jinn became a Jedi Master in his own right, a master who developed an independent attitude towards the Jedi Order.
Qui-Gon is the main character in the first episode of the prequel trilogy, Star Wars: Episode I – The Phantom Menace. He is a Jedi Master and the mentor of Obi-Wan Kenobi.
Yoda came to discover that Qui-Gon had discovered the secret of surviving beyond the grave. In his travels, Qui-Gon had learned much from a Shaman of the Whills, who taught Qui-Gon that a path to spiritual survival required absolute selflessness. Qui-Gon taught these ways to Obi-Wan and Yoda.
Qui-Gon Jinn, who is considered a maverick Jedi Master by his colleagues, might have been able to keep Anakin on the path of the Jedi, had he not been killed by Darth Maul. Star Wars' Qui-Gon Jinn would have been the ideal mentor for the young Anakin.
Whether Vader thought of Qui-Gon specifically was not mentioned. However, it was safe to say he most likely did. Vader felt regret over how he disappointed everyone who cared about him, like Obi-Wan, Padmé, Yoda, etc. In a Darth Vader comic, Vader had a vision of Padmé, and thought he was talking to her.
Over the next decade, the galaxy was on the verge of civil war with entire star systems—led by Count Dooku, Yoda's one-time Padawan—threatening to secede from the Republic by 22 BBY.
Qui-Gon Jinn was more attuned to the Force than any other prequel Jedi, and that's one reason why Emperor Palpatine needed him dead.
After years of training under Dooku, Jinn achieved the rank of Jedi Knight and—after successfully training a Padawan of his own, a farmer's son named Feemor—became a Jedi Master himself.
Padawan Windu was trained in the ways of the Force by Jedi Master Cyslin Myr.
The story centers on Jedi Master Mace Windu as he attempts to rescue his former Padawan, Depa Billaba, from his homeworld, Haruun Kal.
Cin Drallig, Sora Bulq and Grand Master Yoda were also considered swordmasters. All three of them had mastered every known form of lightsaber combat and Sora was known for helping Mace Windu develop his Vaapad fighting style.
Arguably, Qui-Gon is wiser in some ways, given that he knows how to preserve his consciousness in death. Yoda is wise, but sometimes flawed, given that some of his views align with the problematic thinking of the Jedi of this era.
The Shaman of the Whills and Five Priestesses
Even though he perished in battle, Qui-Gon Jinn's consciousness continued. He had found the secret to immortality through the Force.
Palpatine admits to Darth Vader that the Jedi he actually feared most was none other than Jocasta Nu.
Both Jedi Master Yaddle, and now Grogu hold great force powers, but no Jedi Master has ever held greater power than Jedi Master Yoda. Throughout Star Wars canon, Yoda has shown off some incredibly impressive abilities.
Quite simply, Qui-Gon did not have much training when it came to trying to combat Sith Lords, and at the time, it would have been irresponsible for the Jedi Counsel to spend any additional time concerning a threat that was considered long extinct, especially when you add to the fact that they believed they would be ...
Like all in the Order, the young Korun boy was taught by Grand Master Yoda when he was a learner, and eventually went on to become a Padawan to another Jedi. At one point during his apprenticeship, Windu trained under Master T'ra Saa.
Those who followed the light side of the Force and had the appropriate training could achieve a form of immortality by retaining their consciousness after their physical deaths. Qui-Gon Jinn rediscovered this ability and, in turn, taught Yoda and his apprentice Obi-Wan Kenobi how to attain it.
Legend had it that Yoda—a Jedi who became Grand Master—was trained by N'Kata Del Gormo. A Force-sensitive Hysalrian, N'Kata Del Gormo was trained in the ways of the Force and achieved the rank of Master within the Jedi Order.
Yoda didn't specifically know how this would go down, or to what degree Anakin would cause it to happen, but he was playing a much longer game by Revenge of the Sith, and that's at least, in part, explained by Yoda's Force connection with Qui-Gon's spirit.
Palpatine may still have eventually traded Dooku in for a newer apprentice, but nothing would have hindered his rise to power. Had Qui-Gon trained Anakin and kept him far from Palpatine, Anakin might have eventually died in the Clone Wars and been completely unable to fulfill any Chosen One prophecies.
Who was Qui-Gon Jinn's Master? Qui-Gon Jinn's Master was Count Dooku. The relationship between Dooku and his Padawan was largely built on respect, though Jinn often found it difficult to get a read on his Master.