Star Wars: How do the Jedi become Force ghosts after death?

Throughout the Star Wars saga, there have been various Jedi who seemingly live on after death, but how is it possible, and what kind of training does it ta

Force Spirit - Star Wars Guide - IGN

Had the Jedi Order survived Order 66, would Force ghosts have been allowed to be on the Jedi Council? - Quora

How did Anakin become a Force Ghost in Return of the Jedi? - Quora

Force ghost, Wookieepedia

How Exactly Did Anakin Skywalker Become A Force Ghost? — CultureSlate

Can Sith Become Force Ghosts (Canon) - Star Wars Explained

Ahsoka May Confirm Anakin Is A Different Kind Of Force Ghost - With Sith Powers?

star wars - Why hasn't Anakin Skywalker's Force Ghost advised Kylo Ren? - Science Fiction & Fantasy Stack Exchange

Return of the Jedi Themes - Studying Skywalkers