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?
Recently read Hayden’s World and there’s some FTL in there that (mostly) obeys relativity and the associated time dilation issues, so that was fun to see. Also, a generally unpleasant experience for the humans on the craft. Otherwise I liked KSR’s Red/Blue/Green Mars, how the story developed travel technology organically on a timeline.