Time travel conflicts

[PaulaJedi]

Hi, im just new here. I just registered because i will ask a potentially stupid question

I dont know much about time travel but according to my research it is possible to time travel but You cant travel to a time before the machine was invented so it means that you can travel from present to future , future to present right?

But what will happen if you travel to the future, and you took someone from the future and make him kill his grandparents and prevent him from being born.
What will happen to the guy you took from the future? Will he just disappear?
Or my research really is wrong and time travel is just a one way trip to the future

Ps. Im sorry for my english

Research the Multiple Worldline theory. Whenever you time travel, you create a new timeline, so there will be no paradoxes.