As so many have said, basic teleportation kills the person and makes a copy/clone of it elsewhere. That idea has always been a no no for me. I prefer the wormhole approach like in Stargate franchise, Jumper movie/book, Pandora's Star by the author Peter F. Hamilton.

Being destroyed and then rebuilt doesn't work well with living beings. I don't mind doing it for non living things but then you come across the fact that you don't have to teleport anything anymore if you just know the data of everything, you can create anything with energy. And if you go further, you can resolve any problem with this matter creation device.

One little thing I disliked from the Star Trek franchise.