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 exact mechanics are never explained, but I’ve always loved “fenestering” in David Zindell’s Neverwhere and Requiem For Homo Sapiens trilogy.
A pilot, in a one-person “lightship”, interfaces with their computer, merging their minds into one. They then solve maths equations which have never been solved before and prove new mathematical theories. This opens up a window underneath the ship, which it falls in to, into hyperspace. They then need to do more novel maths to open up the window to where they’re going and fall through that.
It’s weird and it’s nerdy and it’s poetic and it’s mystical, like everything in the books, and it’s just so incredibly cool.