Dagobah (Earth-2042)

"Yup, that's it. Dagobah. […] No, I'm not gonna change my mind about this. I'm not picking up any cities or technology. Massive life-form readings, though. There's something alive down there."

- Luke Skywalker

Dagobah is a planet in the Dagobah system, and one of the purest places in the galaxy within the Force. A remote world of swamps and forests, it served as a refuge for Jedi Grand Master Yoda during his exile after the destruction of the Jedi Order. Luke Skywalker received advanced training in the ways of the Force under Yoda on Dagobah, and it was later the place of Yoda's death and transformation into the Force.

Source

 * https://starwars.fandom.com/wiki/Dagobah