Did Luke Know About Exegol?

In the excerpt, Luke Skywalker is transported to Exegol when he's meditating on Tython – basically the light side/Jedi version of what the Sith had on Exegol. He knew immediately where he was. He had been here many times recently, this nightmare landscape of his visions. Only now he knew its name.

Did Anakin go to Exegol?

There may be a disturbing reason for Anakin Skywalker's absence in the Star Wars sequel trilogy, as it's possible his Force Ghost was imprisoned by Palpatine on the Sith redoubt of Exegol, only escaping in time to encourage Rey in Star Wars: The Rise of Skywalker.

Why did Luke go to Exegol?

According to legend, Exegol was the hidden world of the Sith. In 21 ABY, Skywalker began to sense the continued presence of the dark side. As a result, he began to investigate leads that mentioned Exegol. His friend Lando Calrissian joined him in his quest to find Exegol.