let me point this out about teleportation and portals
generally a portal is considered to be moving at such a great speed you move in the space between spaces. the amount of energy it would take to produce such a portal is beyond comprehendable, on top of that there is the problem of sustainability how long can u sustain said portal. whatever you move through this portal how will it emerge out? a black hole for instance destroys matter till it reaches at least the atomic level. so how would a portal be any different
how will you make sure that there is nothing blocking you from point A to point B there are atoms covering each of the spaces. now on top of that what damage might that space you move through go through? there are millions of questions. i would recogmend stephen hawkings works, seriously read them he skims over black holes and the possibility of them acting as "portals" in a few of his books. also the buissness of dark matter (located also in a time magizine) read on it it is actually fascinating
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