"All that we know, we shall share freely with you. All we ask in return is that you keep an open mind, and use this knowledge for the benefit of only one being: yourself. It is not out of greed that we ask this of you, but out of respect. Of all those who might have stumbled upon this device, no one is more deserving of our knowledge than you."
When the Sith were first founded, they created a Holocron that held all the knowledge of the Sith. A repository of wisdom and dark secrets of the force. It was passed down through the generations of Sith lords, gaining more knowledge as those who possessed it poured everything they knew into the Holocron. This Holocron holds secrets of the Sith that few others know and holds guardians of various Sith lords through history, including but not limited to: Ajunta Pall, Naga Sadow, Darth Bane, Darth Revan, and Sidious, to name a few of the more prominent Sith to be in possession and inscribe themselves into the Holocron. The Holocron Contains information about the entire Sith from its start to its fall, all knowledge that the Sith has come to learn through training on the dark side. From Sith Alchemy and the lost lore of the Dark Side to the basics of lightsaber training.