“Objects cannot accelerate to the speed of light within normal spacetime; instead, the Alcubierre drive shifts space around an object so that the object would arrive at its destination more quickly than light would in normal space without breaking any physical laws” https://en.m.wikipedia.org/wiki/Alcubierre_drive
https://youtu.be/QBk8fXaFSMs “For example, if one wanted to travel to Deneb (2,600 light-years away) and arrive less than 2,600 years in the future according to external clocks, it would be required that someone had already begun work on warping the space from Earth to Deneb at least 2,600 years ago:”
If this topic is of interest to you, July I suggest you look into time-space. The introduction by Eric Weinstein is not perfect but it is a start.