Time Travel

Time Travel is IMPOSSIBLE.

Or if it was possible, it would be a huge waste of time.

If you, say, were to go back in time to kill Hitler, you would create an alternate timescale where Hitler would not exist.
In this timescale, you would not have heard of Hitler, so you would not have any idea who he is, meaning you could not have made the decision to go back in time to kill him. If you do not make this decision, you would not have gone back in time to kill him.

Meaning of course, that you didn't kill Hitler, so he would have not died, and if he didn't die (by your hands that is) then the regular timescale would play out, in which you decide to go back in time to kill him.

Trapping you in an ultimate circle.

The same holds true for anyone, going back in time, to make a change that would affect the outcome of history.

But, if you were to go back in time, to observe, that would technically be possible, however even existing at a certain time, on a certain day, may have consequences unbeknownst to you.

Then you'll ask "Hey, doesn't that make time travel possible, and throw your initial statement right out the window?"

No, I stand by my statement, because the instant you successfully create any time travel device, based on what would happen, you would literally destroy the universe creating so many alternate realities where everything is happening all at once.

This is why, time travel is not possible.