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?
Does a TARDIS count?
details on ftl in whoverse is pretty murkey, i think the tardis uses time vortex to travel through time and space. most species seems to be highly intergalatic ftl, since most of them travel across the universe, it doesnt really explain in a scifi way how it works like trek and sg1 does. slitheen uses a slipstream drive.