system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What exactly did the Sith do in the first place?

Okay so I know there was a Sith holocaust, but what did they do to piss the Jedi off so bad that they committed genocide, and then continued to hunt them until the end of time?
gpt
This is all purely legend.

The Sith were originally a species of Red skinned bipedals who resides on the planet of Moraband (also known as Koriban).

They made contact with the Republic, and the Jedi as well, around 10,000 BBY.  A Sith Lord Naga Sadow spread the seeds of the war between the two factions, and then led the Sith in an unsuccessful war against the republic.

The Sith would reappear every few centuries, reigniting war across the galaxy for nearly 9,000 years.

This finally cumulated in the New Sith Wars, which were a thousand year period where the Sith and the Jedi fought over the fate of the galaxy.

From 2,000 to 1010 BBY the republic fought a large number of different Sith clans and factions that sought to control the galaxy.

In 1010 BBY the Sith finally United themselves into a single coalition. They waged the greatest war the galaxy had ever seen, and nearly collapsed the Republic itself. 

This war ended with the Sevent Battle of Ruuslan, where Lord Hoth's Army of the Light defeated the Sith.

However, there was one survivor. Darth Bane.