Holocron

Click on the picture of the Holocron to go to The Dark Holocron "Sith Teachings" webpage. These will give you the basics on Sithology.

Basic Ranking System(Pre-Written/Old Laws)
-Acolyte: Sith Acolytes, also called a Sith Apprentice, are the raw recruits that enter into the Sith Order for training in the ways of the Dark Side. While most possess no practical applicant knowledge of the Force, they are often regarded as mere Dark Jedi, and require the training of a Sith Crusader/Master, or if they show unique promise, a Sith Lord, to teach them the aspects of the Dark Side of the Force and truly become a member of the Sith Order.

-Crusader: Sith Crusaders, or simply Sith make up the bulk of the Sith Order's forces. The few Acolytes that were able to master their training and progress to the degree that their masters deem them worthy now rightfully bear the mantle of “Sith.”

-Master: The Sith Masters are the elite of the Order, and represent the few that have come to a true understanding of the Dark Side of the Force, and bending it to their will. Dreaded as they are renowned, Sith Masters could be the most deadly of warriors and the most learned in the art of manipulation, making them the masters of the Dark Side and the Sith Order of the highest caliber, far surpassing the ferocity and prowess of the Sith Crusaders. The most exceptional of the Sith Masters may be elevated to the most coveted position of Sith Lord. It is also at the rank of Master that a Sith may challenge a Sith Lord for their title and position with a sense of validity and weight.

-Lord: The Sith Lord, or Sith Lady, is one of few individuals that are among the most elite of the Order, it is these few men and women that are among the truly terrifying. To attain this rank is considered the height of glory and opens doors that would be closed to most any other, including the possibility to challenge a Darth of the Dark Council for their title and seat. New paths to power one may not have dreamed of prior. To be recognized as a Lord of the Sith grants one the authority to do as they please so long as it does not directly contradict what they were told by one of the Dark Council or pre-established laws.

-Darth: The Dark Council is a gathering of the most powerful and skilled Sith within the Order, with power and responsibility second only to the Empress and the Dark Lord. Chosen from within the ranks of the Sith Lords, either by rite of combat or by the Dark Lord based on their unparalleled skill, they are the true elite of the Sith Order. Granted the title of Darth, they are given near complete dominion over different facets of the Sith Order, answering only to the Dark Lord's will. This does not however mean that their position is secure; any who attain the rank of Sith Lord may challenge a Darth for their seat; the old falling and the new rising has always been the way of the Sith, and a Darth who cannot defend his seat from a challenger is unworthy of it in the first place.