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?
Star Control had an interesting take on it, where you’re able to jump between eiffererent “levels” of space if you have something that can induce the right field and at the right level of power. Sort of like jumping between electron shells or something.
But you can jump from normal space, to hyperspace on top of that, to quasispace on top of that. And maybe others above (and below). Traveling a certain distance in each space allows you to travel an exponentially larger amount of distance in the lower space.
So you induce a field, pop up to hyperspace, move at less than FTL (as relative to hyperspace), then fall back to regular space.