According to Star Wars: Absolutely Everything You Need To Know, Yoda trained approximately 20,000 Jedi after reaching the rank of Master. Although it's a very impressive number, it's important to keep in mind that Yoda lived for 900 years, and became Master around the age of 100.
Who was Yoda's Padawan learner? Yoda has had many Padawan Learners, but his most famous Padawan, also turned into one of the Jedi's greatest enemies. Count Dooku was known to be one of the greatest lightsaber duelist in Jedi and Sith History.
Yoda & Luke Skywalker
A shoutout also deserves to go out to Obi-Wan and Luke, but Yoda and Luke are the true master and apprentice duo, and the two training is one of the highlights of the original trilogy.
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.
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.
Ahsoka Tano, a Togruta female, was the Padawan learner to Anakin Skywalker and a hero of the Clone Wars. Alongside Anakin, she grew from headstrong student into a mature leader.
When Obi-Wan tells Yoda that Luke is their “last hope,” Yoda says, “No. There is another.” While the events of Return of the Jedi suggest this “other” person was Leia, it's also possible Yoda was referring to Rey.
Dooku voluntarily left the light side behind and became Darth Sidious' dark side disciple, taking the secret name Darth Tyranus and leading the Separatist army.
The Grand Master's apprentice
At one time, Dooku was the Padawan of Yoda, the Grand Master of the Jedi Order.
She eventually became the Padawan of a human male Jedi Master, Stellan Gios. Vernestra was enough of a prodigy that she eventually attained the rank of Jedi Knight at the age of only fifteen, making her the youngest Knight in a generation.
Yoda confronted Sidious in the heart of the Senate chambers. This erupted into an intense duel between these masters of the Force, a fight that Yoda ultimately lost and was forced to flee. With the Galactic Empire triumphant, Yoda and Obi-Wan were the last of the Jedi.
Mission to Mathas. Padawan Windu was trained in the ways of the Force by Jedi Master Cyslin Myr.
That said, both Yoda and Yaddle have a high midi-chlorian count in their blood. Yoda's m-count was roughly 18000, while Yaddle's was closer to 12000.
Season one. Grogu first appears in the series debut, "Chapter 1: The Mandalorian", when the Mandalorian accepts a valuable commission from a mysterious man known only as "The Client" (Werner Herzog), who works for a remnant of the now-fallen Galactic Empire.
Grogu joined Luke's fledgling generation of Jedi in 9 ABY (the setting of The Mandalorian and The Book of Boba Fett) while Ben Solo became Luke's “first student” in 15 ABY.
In the now-abandoned Legends continuity, his birth name appeared to be Maul, with the title of "Darth" simply added to it when he was taken on as an apprentice by Darth Sidious.
A Sith Lord with the ability to prevent death and create life, Plagueis is the mentor of Sheev Palpatine/Darth Sidious, who, in accordance to the Sith's Rule of Two, eventually betrays Plagueis by murdering him in his sleep, taking his place as Sith Master.
Bottom line, Dooku never considered himself a Sith. And he wasn't; he was a man looking to change the galaxy in a way the Jedi were unwilling to try. And that is why he joined the Sith and became Darth Sidious' apprentice, Darth Tyrannus. When Dooku became Sidious's apprentice, he was already an elderly man.
However, Yoda eventually lost his weapon when he dueled the Dark Lord of the Sith Darth Sidious in the Senate Building. When Sidious unleashed bolts of energy to disarm him, the Jedi Master lost his lightsaber, which fell to the ground below.
While the Shaman of the Whills was not there to carry on his teachings, Qui-Gon was able to pass on his knowledge of immortality to Master Yoda. He instructed Yoda to meet with the five Force Priestesses: Serenity, Joy, Anger, Confusion, and Sadness.
Owen Lars was a young adult when his father Cliegg married Shmi Skywalker, a Mos Espa slave he'd purchased and then freed. After Tusken Raiders kidnapped Owen's stepmother, a Jedi Padawan arrived in search of Shmi. This was Shmi's son Anakin, the stepbrother Owen had wondered if he'd ever meet.
Grogu is not in the sequel trilogy, so he must have died sometime before the beginning of Episode VII. Maybe Kylo Ren killed him when Ren destroyed Luke's academy, maybe the First Order found and ended him, or maybe he died on a Jedi mission.
A Jedi Master may not have more than one Padawan. This particular rule developed after the Old Sith Wars, as most ancient Masters such as Arca Jeth, Thon, Vodo-Siosk Baas and Krynda Draay did not have to abide by it.