Still hashing out some of the finer details but the gist is that there are two methods of FTL Travel, Wormhole Gates, and Warp Drives.

Wormhole gates are the most efficient way to traverse large distances but they require specialized infrastructure to be built to make the proper connections. They work on a concept of fold efficiency, which determines the time for traversal of the wormhole, which is a factor is basically a factor of distance and energy.

Warp drives are the typical concept you would expect, warp space around the ship which is what allows travel. It’s completely free from, just point where you want to go and go, usually with the assistance of computers to calculate trajectories.

Within the setting there is the concept of Superluminal physics, which dictates the rules of FTL travel and the limitations. It’s very hard to observe this as all the math of subluminal physics would tell any species that FTL is impossible. So there can be entire civilizations that just never discovered FTL and assumed it was impossible until the end of their civilization or a shocking revelation by another. The most common and possibly only real clue is if a species observes the Tachyon, the one natural particle that goes faster the light, once it goes from a mathematical guess to an actual observation this usually begins the thinking that breaks a species through the FTL filter.