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?
The Hyperspace Gates in Cowboy Bebop always seemed to be pretty plausible. They didn’t explain all the science behind them, but there was enough to show that the was science behind it, and it had been commercialized enough that people had a basic understanding of them.