Confused about moveing through time

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I was reading about worm holes and stuff like that, and I don’t get it. What dose going back in time really mean? If it just changes the time, how dose that all of the sudden give you the power to... kill your grandfather and create the Grandfather paradox, or walk around in the past... It wouldn’t be all that fantastic really; you couldn’t even tell that you went back in time. So I’m just a bit confused as to what happens in a “you move to a different time” scenario, like a wormhole :(sorry about spelling)
I hop this is the right place to post this?
 
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Time travel ( except in the forward direction) is a dubious idea so one shouldn't take it too seriously. It does provide lots of good storylines for SF writers, though.:smile:
 
It's just plain, old, not possible and not true. There is no use speculating over how "reverse time travel" works because such a thing is fiction.
 
time is a mathematical invention to understand the dynamics of a system..nothing more.
 
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