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?
You might like Larry Nivens Known Space books (such as Ringworld, among many others) as it’s hyperspace makes most people’s minds freak out. Very few people are capable of looking out a window in hyperspace and not going at least a little bit loopy.
It’s also implied that Things live in the gravity wells and that’s why you need to be far enough away before you make the jump but this isn’t really developed much.