This can be anything from Hyperspace in Star Wars, Warp Drive in Star Trek, travel through the Warp in Warhammer 40k or anything else.
I’ve always liked “slow” FTL travel, where going a few light-years still takes a few days or so. I also really like travel through an alternate dimension like in 40k, Event Horizon, Witchspace in Elite Dangerous.
I wanna know your favorite versions, or do you prefer stories that obey the laws of known physics, like the Expanse or Rimworld?
I do love how the side effects (leaking improbability) were critical to the story making any plausible sense.
Throw in bistro-mathematics as an alternative star drive.
It’s such a genius idea because it’s not only a super original way to do FTL, but it also gives you a perfect way out for any plot holes lol