Portals (to other dimensions) already exist out there. I have no idea how they work though.
I sometimes travel to other realities in my dreams, but this didn't happen in some time... :(
Teleportation though ... I'd say for now it's still science fiction. Some people talk about astral projection/travel instead which takes some time to achieve. I haven't been able to, so I can't say it even works.
i hope others can help you more than me. Good luck!
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