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?
That is what I said, near light travel, not FTL. Ansible comms where instantaneous (speed of thought iirc), but not when the veasels/ships where in-transit, as they needed to “buffer” the communications somehow, in form of recorded messages. That is why Ender’s journeys took thousands of years, where only a lifetime for his siblings on earth.