Anakin and Obi-wan when they first met

Obi-Wan was right to be concerned.

He was unable to control the power inside his student and eventually lost him to the dark side, as Anakin is reborn as a Dark Lord of the Sith, Darth Vader.

Obi-Wan played a vital role in hiding Anakin's children, Luke and Leia, from their father and his evil master, the Emperor Palpatine.

As the Jedi's were slowly wiped out by the Emperor, Obi-Wan went into hiding on Tatooine for decades and became known as Ben.

Darth Vader

Eventually, Luke Skywalker finds Obi-Wan and Luke's training as a Jedi begins with him getting his father's old lightsaber.

It is during a mission with Luke that Obi-Wan dies during a fight with the evil Darth Vader.

Obi-Wan returned from the grave to guide Luke to Jedi Master Yoda and carried on supporting Luke after he had learned about his father.